Adjustable voltage controlled oscillator
AssigneeDelphi Technologies, Inc.
InventorsGregory J. Manlove, Lawrence D. Hazelton, Mark B. Kearney
Life of this patent
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Abstract
An adjustable voltage controlled oscillator has an input for receiving a voltage signal and an integrator coupled to the input for generating a ramp signal. The circuit also includes an adjustable current supply coupled to an output of the integrator for supplying an adjustable amount of current. A comparator compares the ramp signal with a predetermined voltage. The circuit further includes an output for generating a frequency output as a function of the comparison, wherein the circuit is calibratible by adjusting current generated by the adjustable current supply.
Claims21
An adjustable voltage controlled oscillator circuit for converting a voltage to a frequency, said voltage controlled oscillator circuit comprising:
- an input for receiving a voltage input signal;
- an integrator coupled to said input for receiving the voltage input signal and generating a ramp signal;
- an adjustable current supply coupled to the integrator for supplying an adjustable amount of current;
- a comparator for comparing the ramp signal with a predetermined voltage;
- and
- an output for generating a frequency output signal as a function of the comparison, wherein said oscillator circuit is calibratable by adjusting current generated by the adjustable current supply, wherein said integrator comprises an operational amplifier having a negative terminal and a positive terminal, wherein said voltage input signal is applied to the negative terminal and a reference voltage is applied to the positive terminal.
An adjustable voltage controlled oscillator circuit for converting a voltage to a frequency, said voltage controlled oscillator circuit comprising:
- an input for receiving a voltage input signal;
- an integrator coupled to said input for receiving the voltage input signal and generating a ramp signal;
- an adjustable current supply coupled to the integrator for supplying an adjustable amount of current;
- a comparator for comparing the ramp signal with a predetermined voltage;
- an output for generating a frequency output signal as a function of the comparison, wherein said oscillator circuit is calibratable by adjusting current generated by the adjustable current supply;
- and
- a oneshot circuit coupled to the output of the comparator.
An adjustable voltage controlled oscillator circuit for converting a voltage to a frequency, said voltage controlled oscillator circuit comprising:
- an input for receiving a voltage input signal;
- an integrator coupled to said input for receiving the voltage input signal and generating a ramp signal;
- an adjustable current supply coupled to the integrator for supplying an adjustable amount of current;
- a comparator for comparing the ramp signal with a predetermined voltage;
- an output for generating a frequency output signal as a function of the comparison, wherein said oscillator circuit is calibratable by adjusting current generated by the adjustable current supply;
- and
- a voltage regulator coupled to a voltage supply, wherein said voltage regulator generates a regulated voltage supply for powering the integrator and comparator.
An adjustable voltage controlled oscillator circuit for converting a voltage to a frequency, said voltage controlled oscillator circuit comprising:
- an input for receiving a voltage input signal;
- an integrator coupled to said input for receiving the voltage input signal and generating a ramp signal;
- an adjustable current supply coupled to the integrator for supplying an adjustable amount of current;
- a comparator for comparing the ramp signal with a predetermined voltage;
- and
- an output for generating a frequency output signal as a function of the comparison, wherein said oscillator circuit is calibratable by adjusting current generated by the adjustable current supply, wherein said adjustable current supply comprises a first current supply coupled to the input of the integrator and a second current supply coupled to the output of the integrator and supplying current thereto.
An adjustable voltage controlled oscillator circuit for converting a voltage to a frequency, said voltage controlled oscillator circuit comprising:
- an input for receiving a voltage input signal;
- an integrator coupled to said input for receiving the voltage input signal and generating a ramp signal;
- an adjustable current supply coupled to the integrator for supplying an adjustable amount of current to an input and output of the intergrator;
- a comparator for comparing the ramp signal with a predetermined voltage;
- and
- an output for generating a frequency output signal as a function of the comparison, wherein said oscillator circuit is calibratable by adjusting current generated by the adjustable current supply, wherein said circuit has about a fifty percent duty cycle.
An adjustable voltage controlled oscillator circuit for converting a voltage to a frequency, said voltage controlled oscillator circuit comprising:
- an input for receiving a voltage input signal;
- an integrator coupled to said input for receiving the voltage input signal and generating a ramp signal;
- an adjustable current supply coupled to the integrator for supplying an adjustable amount of current;
- a comparator for comparing the ramp signal with a predetermined voltage;
- and
- an output for generating a frequency output signal as a function of the comparison, wherein said oscillator circuit is calibratable by adjusting current generated by the adjustable current supply, wherein said input voltage is generated by a mass air flow meter for metering air flow into an internal combustion engine.
A voltage controlled oscillator circuit for converting a voltage to a frequency, said voltage controlled oscillator circuit comprising:
- an input for receiving a voltage input signal;
- an integrator coupled to said input for receiving the voltage input signal and generating a ramp signal;
- a first current supply coupled to an input of the integrator for supplying a first current;
- a second current supply coupled to an output of the integrator for supplying a second current;
- a comparator for comparing the ramp signal with a predetermined voltage;
- and
- an output for generating a frequency output signal as a function of the comparison, wherein said first and second currents are applied together so as to reduce the amount of current required by the integrator, wherein said integrator comprises an operational amplifier having a negative terminal and a positive terminal, and wherein said voltage input signal is applied to the negative terminal, a reference voltage is applied to the positive terminal, and said first current is applied to the negative terminal.
An adjustable voltage controlled oscillator circuit for use in a mass air flow meter, said voltage controlled oscillator circuit comprising:
- an input for receiving a voltage input signal;
- an integrator coupled to the input for receiving the voltage input signal and generating a ramp signal, said integrator including an operational amplifier, a resistance, and a capacitance;
- a first adjustable current supply coupled to an input of the integrator for supplying an adjustable first current;
- a second adjustable current supply coupled to an output of the integrator for supplying an adjustable second current;
- a comparator for comparing the ramp signal with a predetermined voltage;
- and
- an output for generating a frequency output signal as a function of the comparison, wherein said adjustable circuit is calibratable by adjusting the first current generated by the first adjustable current supply.
Dependencies are inferred from the claim text.