Oscillator circuit and method for influencing, controlling, or regulating the frequency of an oscillator

An oscillator circuit with an oscillator (112, 212) comprising a toggle circuit (3), a Schmitt trigger (3) or a multi-vibrator or a relaxation oscillator or an amplifier circuit with hysteresis behavior, having an output (A) and an inverting input (E−), whereby

• the output (A) is connected to the inverting input (E−) via a feedback resistor (RR),
• the inverting input (E−) is connected to a first potential via a first oscillator capacitor (OC1),
• the inverting input (E−) is also connected to a second potential via a second oscillator capacitor (0C2) and via a control resistor (Rvar, RST, ST1, ST2, ST3, ST4) that is series-connected to said second oscillator capacitor, and whose value can be adjusted or electrically controlled,
• so that a frequency (f) of the oscillator (112, 212) can be varied by changing the value of the control resistor (Rvar, RST, ST1, ST2, ST3, ST4),
• wherein the control resistor (Rvar, RST) is made up of a collector-emitter channel or a drain-source channel of a control transistor (ST3, ST4), at whose emitter or source a control voltage (Uc) has been applied and whose base or gate is connected to a third potential (Q″), so that
• the second oscillator capacitor (OC2) is connected to the second potential, especially to ground, via the collector-emitter channel or via the drain-source channel of the control transistor (ST1, ST2).

An oscillator circuit characterized in that

• an oscillator circuit with an oscillator (112, 212) comprising a toggle circuit (3), a Schmitt trigger (3) or a multi-vibrator or a relaxation oscillator or an amplifier circuit with hysteresis behavior, having an output (A) and an inverting input (E−), whereby
• the output (A) is connected to the inverting input (E−) via a feedback resistor (RR),
• the inverting input (E−) is connected to a first potential via a first oscillator capacitor (OC1),
• the inverting input (E−) is also connected to a second potential via a second oscillator capacitor (OC2) and via a control resistor (Rear, RST, ST1, ST2, ST3, ST4) that is series-connected to said second oscillator capacitor, and whose value can be adjusted or electrically controlled,
• so that a frequency (f) of the oscillator (112, 212) can be varied by changing the value of the control resistor (Rvar, RST, ST1, ST2, ST3, ST4), the control resistor (Rvar, RST) is made up of a collector-emitter channel or a drain-source channel of a control transistor (ST1, ST2), at whose base or gate a control voltage (Uc) has been applied, so that
• the second oscillator capacitor (OC2) is connected to the second potential, especially to ground, via the collector-emitter channel or via the drain-source channel of the control transistor (ST1, ST2),
• and the frequency (f) of the oscillator (112, 212) can be varied by changing the control voltage (Uc),
• wherein
• the base or gate of the control transistor (ST1, ST2) is connected to the output (IA) of an integrator (211, 211′, 211A, 211B, 211C) whose input (IE, IE+, IE−) is connected to a trigger output (AUS2, BA, BA′) of a trigger circuit (210, 210′, 310), whereby
• the trigger circuit (210, 210′, 310) is capable of delivering a trigger signal (OUT1) to the input (IE, IE+, IE−) of the integrator (211, 211′, 211A, 211B, 211C) via the trigger output (AUS2, BA, BA′), said trigger signal being either equal to or smaller than a first voltage value (U1) or equal to or greater than a second voltage value (U2), whereby the first voltage value (U1) is smaller than the second voltage value (U2), and
• the integrator (211, 211′, 211A, 211B, 211C) is capable of integrating the trigger signal (OUT1) into the control voltage (Uc) and of delivering it via the output (IA) of the integrator (211, 211′, 211A, 211B, 211C) to the base or gate of the control transistor (ST1, ST2),
• so that
• either the control voltage (Uc) drops if the trigger signal (OUT1) is equal to or smaller than the first voltage value (U1), and then the control voltage (Uc) rises if the trigger signal (OUT1) is equal to or greater than the second voltage value (U2),
• or vice versa,
• and thus the frequency (0 of the oscillator (112, 212) or its rate of change can be influenced or controlled by the trigger signal (OUT1).

An oscillator circuit characterized in that

• an oscillator circuit with an oscillator (112, 212) comprising a toggle circuit (3), a Schmitt trigger (3) or a multi-vibrator or a relaxation oscillator or an amplifier circuit with hysteresis behavior, having an output (A) and an inverting input (E−), whereby
• the output (A) is connected to the inverting input (E−) via a feedback resistor (RR),
• the inverting input (E−) is connected to a first potential via a first oscillator capacitor (OC1),
• the inverting input (E−) is also connected to a second potential via a second oscillator capacitor (OC2) and via a control resistor (Rvar, RST, ST1, ST2, ST3, ST4) that is series-connected to said second oscillator capacitor, and
• whose value can be adjusted or electrically controlled, so that a frequency (f) of the oscillator (112, 212) can be varied by changing the value of the control resistor (Rvar, RST, ST1, ST2, ST3, ST4), the control resistor (Rvar, RST) is made up of a collector-emitter channel or a drain-source channel of a control transistor (ST1, ST2), at whose base or gate a control voltage (Uc) has been applied, so that
• the second oscillator capacitor (0C2) is connected to the second potential, especially to ground, via the collector-emitter channel or via the drain-source channel of the control transistor (ST1, ST2),
• and the frequency (f) of the oscillator (112, 212) can be varied by changing the control voltage (Uc),
• wherein
• the base or gate of the control transistor (ST1, ST2) is connected to the output (IA) of an integrator (211, 211′, 211A, 211B, 211C) whose input (IE, IE+, IE−) is connected to a trigger output (AUS2, BA, BA′) of a trigger circuit (210, 210′, 310),
• wherein the trigger circuit (210, 210′, 310) is capable of delivering a trigger signal (OUT1) to the input (IE, IE+, IE−) of the integrator (211, 211′, 211A, 211B, 211C) via the trigger output (AUS2, BA, BA'), said trigger signal being either equal to or smaller than a first voltage value (U1) or equal to or greater than a second voltage value (U2), whereby the first voltage value (U1) is smaller than the second voltage value (U2),
• wherein the trigger signal (OUT1) is a pulse-modulated 1-bit signal that alternates essentially like a square wave between the first and second voltage values (U1, U2), so that
• either the control voltage (Uc) can be lowered in that a mean value of the trigger signal (OUT1) is decreased by correspondingly changing a time sequence of the first and second voltage values (U1, U2), and the control voltage (Uc) can be raised in that the mean value of the trigger signal (OUT1) is increased by correspondingly changing the time sequence of the first and second voltage values (U1, U2),
• or vice versa,
• and thus the frequency (f) of the oscillator (112, 212) or its rate of change can be influenced or controlled via the pulse-modulated 1-bit signal.

A method to influence, control or regulate a frequency of an oscillator (112, 212), whereby

• the oscillator (112, 212) employed is one that comprises a toggle circuit (3), a Schmitt trigger (3) or a multi-vibrator or a relaxation oscillator or an amplifier circuit with hysteresis behavior, having an output (A) and an inverting input (E−),
• the output (A) is connected to the inverting input (E−) via a feedback resistor (RR),
• the inverting input (E−) is connected to a first potential via a first oscillator capacitor (OC1),
• the inverting input (E−) is also connected to a second potential via a second oscillator capacitor (OC2) and via a control resistor (Rvar, RST, ST1, ST2, ST3, ST4) that is series-connected to said second oscillator capacitor, and whose value can be adjusted or electrically controlled,
• and the frequency (f) of the oscillator (112, 212) is varied by changing the value of the control resistor (Rvar, RST, ST1, ST2, ST3, ST4),
• wherein the control resistor (Rvar, RST) is made up of a collector-emitter channel or a drain-source channel of a control transistor (ST3, ST4), at whose emitter or source a control voltage (Uc) is applied, and whose base or gate is connected to a third potential (Q″), so that
• the second oscillator capacitor (OC2) is connected to the second potential via the collector-emitter channel or the drain-source channel of the control transistor, and thus the control transistor is operated as a common base or common gate,
• and the frequency (f) of the oscillator (112, 212) is varied by changing the control voltage (Uc).

A method to influence, control or regulate a frequency of an oscillator (112, 212), whereby

• the oscillator (112, 212) employed is one that comprises a toggle circuit (3), a Schmitt trigger (3) or a multi-vibrator or a relaxation oscillator or an amplifier circuit with hysteresis behavior, having an output (A) and an inverting input (E−),
• the output (A) is connected to the inverting input (E−) via a feedback resistor (RR),
• the inverting input (E−) is connected to a first potential via a first oscillator capacitor (OC1),
• the inverting input (E−) is also connected to a second potential via a second oscillator capacitor (0C2) and via a control resistor (Rya, RST, ST1, ST2, ST3, ST4) that is series-connected to said second oscillator capacitor, and whose value can be adjusted or electrically controlled,
• and the frequency (f) of the oscillator (112, 212) is varied by changing the value of the control resistor (Rvar, RST, ST1, ST2, ST3, ST4),
• wherein
• a collector-emitter channel or a drain-source channel of a control transistor (ST1, ST2), is used as the control resistor
• (Rvar, RST), so that the second oscillator capacitor (0C2) is connected to the second potential, especially to ground, via the collector-emitter channel or via the drain-source channel of the control transistor (ST1, ST2),
• a control voltage (Uc) is applied at the base or gate of the control transistor (ST1, ST2),
• and the frequency of the oscillator (112, 212) is varied by changing the control voltage (Uc) wherein
• the control resistor (ST1, ST2) employed is one whose base or gate is connected to the output (IA) of an integrator (211, 211′, 211A, 211B, 211C) whose input (IE, IE+, IE−) is connected to a trigger output (AUS2, BA, BA') of a trigger circuit (210, 210′, 310), whereby
• the trigger circuit (210, 210′, 310) employed is one that is capable of delivering a trigger signal (OUT1) to the input (IE, IE+, IE−) of the integrator (211, 211′, 211A, 211B, 211C) via the trigger output (AUS2, BA, BA'), said trigger signal being either equal to or smaller than a first voltage value (U1) or equal to or greater than a second voltage value (U2), whereby the first voltage value (U1) is smaller than the second voltage value (U2), and
• the integrator (211, 211′, 211A, 211B, 211C) employed is one that is capable of integrating the trigger signal (OUT1) into the control voltage (Uc) and of delivering it to the base or gate of the control transistor (ST1, ST2) via the output (IA) of the integrator (211, 211′, 211A, 211B, 211C),
• and whereby either
• the control voltage (Uc) can be lowered in that the trigger circuit (210, 210′, 310) is controlled in such a way that the trigger signal (OUT1) is equal to or smaller than the first voltage value (U1),
• and the control voltage (Uc) can be raised in that the trigger circuit (210, 210′, 310) is controlled in such a way that the trigger signal (OUT1) is equal to or greater than the second voltage value (U2),
• or vice versa, so that the frequency (0 of the oscillator (112, 212) or its rate of change is influenced or controlled by the trigger signal (OUT1).

A method to influence, control or regulate a frequency of an oscillator (112, 212), whereby

• the oscillator (112, 212) employed is one that comprises a toggle circuit (3), a Schmitt trigger (3) or a multi-vibrator or a relaxation oscillator or an amplifier circuit with hysteresis behavior, having an output (A) and an inverting input (E−),
• the output (A) is connected to the inverting input (E−) via a feedback resistor (RR),
• the inverting input (E−) is connected to a first potential via a first oscillator capacitor (OC1),
• the inverting input (E−) is also connected to a second potential via a second oscillator capacitor (OC2) and via a control resistor (Rvar, RST, ST1, ST2, ST3, ST4) that is series-connected to said second oscillator capacitor, and whose value can be adjusted or electrically controlled,
• and the frequency (0 of the oscillator (112, 212) is varied by changing the value of the control resistor (Rvar, RST, ST1, ST2, ST3, ST4),
• wherein
• a collector-emitter channel or a drain-source channel of a control transistor (ST1, ST2), is used as the control resistor
• (Rvar, RST), so that the second oscillator capacitor (0C2) is connected to the second potential, especially to ground, via the collector-emitter channel or via the drain-source channel of the control transistor (ST1, ST2),
• a control voltage (Uc) is applied at the base or gate of the control transistor (ST1, ST2),
• and the frequency of the oscillator (112, 212) is varied by changing the control voltage (Uc), wherein
• the control voltage (Uc) and thus the frequency (0 of the oscillator (112, 212) are influenced, controlled or regulated via a modulated 1-bit signal, especially via a pulse width modulation,
• wherein the control resistor (ST1, ST2) employed is one whose base or gate is connected to the output (IA) of an integrator (211, 211′, 211A, 211B, 211C) whose input (IE, IE+, IE−) is connected to a trigger output (AUS2, BA, BA′) of a trigger circuit (210, 210′, 310), whereby
• the trigger circuit (210, 210′, 310) employed is one that is capable of delivering a trigger signal (OUT1) to the input (IE, IE+, IE−) of the integrator (211, 211′, 211A, 211B, 211C) via the trigger output (AUS2, BA, BA'), said trigger signal being either equal to or smaller than a first voltage value (U1) or equal to or greater than a second voltage value (U2), whereby the first voltage value (U1) is smaller than the second voltage value (U2), wherein
• a pulse-modulated 1-bit signal that alternates essentially like a square wave between the first and second voltage values (U1, U2) is used as the trigger signal (OUT1), so that
• either the control voltage (Uc) can be lowered in that a mean value of the trigger signal (OUT1) is decreased by correspondingly changing a time sequence of the first and second voltage values (U1, U2), and the control voltage (Uc) can be raised in that the mean value of the trigger signal (OUT1) is increased by correspondingly changing the time sequence of the first and second voltage values (U1, U2)
• or vice versa,
• and the frequency (0 of the oscillator (112, 212) or its rate of change is influenced or controlled via the pulse-modulated 1-bit signal.