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US 2017/0257066 A1Published application
Systems and methods for compensating for variation in an amplitude-regulated oscillator
AssigneeQUALCOMM Incorporated
InventorsNITZ SAPUTRA, Sang Min Lee, Dongwon Seo
Life of this patent
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Abstract
Circuits and methods for compensating variation in an amplitude-regulated oscillator are provided. In one example, the oscillator includes a diode clamp having back-to-back diode-connected transistors with body terminals. Circuits and methods modulate a body-source voltage of the diode-connected transistors to compensate for process, temperature, and voltage variation.
Claims30
A circuit comprising:
- an oscillator;
- a diode clamp implemented in the oscillator and configured to regulate an amplitude of the oscillator, wherein the diode clamp includes a plurality of diode-connected transistors, each of the diode-connected transistors including a body terminal;
- and
- a compensation circuit in communication with the diode clamp and configured to modulate a body-source voltage of the diode-connected transistors in accordance with a current or voltage level of a transistor in the compensation circuit.
1 more element
A method performed by a circuit having an oscillator, the method comprising:
- receiving a common mode voltage (VCM) at the oscillator, wherein the oscillator includes a plurality of diode-connected transistors receiving VCM at their respective source terminals;
- receiving a body bias voltage at body terminals of the diode-connected transistors;
- regulating an amplitude of an output clock signal of the oscillator by the diode-connected transistors;
- and
- modulating a body-source voltage (VBS) of the diode-connected transistors in accordance with a voltage or current level of a transistor in a compensation circuit in communication with the oscillator.
2 more elements
A circuit comprising:
- means for generating a clock signal;
- means for regulating an amplitude of the clock signal generating means, the regulating means including coupled diodes having diode-connected transistors, each of the diode-connected transistors including a body terminal receiving a body bias voltage;
- and
- means for modulating a body-source voltage of the diode-connected transistors in accordance with a gate voltage level of a transistor in the modulating means.
1 more element
A circuit comprising:
- a Wien bridge oscillator;
- a diode clamp in communication with the Wien bridge oscillator, the diode clamp including a plurality of diode-connected transistors, each of the diode-connected transistors having a body terminal receiving a body bias voltage and having a source terminal receiving a common mode voltage;
- and
- a compensation circuit in communication with the Wien bridge oscillator, the compensation circuit including a plurality of series-connected diodes having a voltage drop configured to adjust a body-source voltage of the diode connected transistors.
1 more element
Dependencies are inferred from the claim text.