Voltage controlled oscillator power supply and temperature compensation circuit
First Claim
1. A supply voltage pushing compensation circuit stage for use with a variable delay circuit stage comprising one or more delay stages and an analogue multiplexer arranged to control the amount of delay introduced by the delay stages;
- the compensation circuit comprising;
a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal supply voltage which changes said delay.
12 Assignments
0 Petitions
Accused Products
Abstract
Circuits such as Phase Lock Loops which use VCO'"'"'s are affected by temperature and power supply variations which effect the performance of the circuit, particularly at high frequencies and low supply voltages. The present invention provides a variable delay circuit stage comprising one or more delay stages and an analogue multiplexer arranged to control the amount of delay introduced by the delay stages; a supply voltage pushing compensation circuit stage comprising a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal supply voltage which changes said delay; and a temperature pushing compensation circuit stage comprising a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal temperature which changes said delay.
34 Citations
8 Claims
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1. A supply voltage pushing compensation circuit stage for use with a variable delay circuit stage comprising one or more delay stages and an analogue multiplexer arranged to control the amount of delay introduced by the delay stages;
- the compensation circuit comprising;
a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal supply voltage which changes said delay. - View Dependent Claims (2)
- the compensation circuit comprising;
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3. A temperature pushing compensation circuit stage for use with a variable delay circuit stage comprising one or more delay stages and an analogue multiplexer arranged to control the amount of delay introduced by the delay stages;
- the compensation circuit comprising;
a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal temperature which changes said delay. - View Dependent Claims (4)
- the compensation circuit comprising;
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5. A variable delay circuit stage comprising:
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one or more delay stages and an analogue multiplexer arranged to control the amount of delay introduced by the delay stages;
a supply voltage pushing compensation circuit stage comprising a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal supply voltage which changes said delay; and
a temperature pushing compensation circuit stage comprising a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal temperature which changes said delay.
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6. A voltage controlled oscillator comprising one or more variable delay circuit stages each comprising:
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one or more delay stages and an analogue multiplexer arranged to control the amount of delay introduced by the delay stages;
a supply voltage pushing compensation circuit stage comprising a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal supply voltage which changes said delay; and
a temperature pushing compensation circuit stage comprising a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal temperature which changes said delay.
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7. A Phase Lock Loop comprising a voltage controlled oscillator comprising one or more variable delay circuit stages each comprising:
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one or more delay stages and an analogue multiplexer arranged to control the amount of delay introduced by the delay stages;
a supply voltage pushing compensation circuit stage comprising a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal supply voltage which changes said delay; and
a temperature pushing compensation circuit stage comprising a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal temperature which changes said delay.
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8. A clock and data recovery circuit arrangement comprising a Phase Lock Loop comprising a voltage controlled oscillator comprising one or more variable delay circuit stages each comprising:
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one or more delay stages and an analogue multiplexer arranged to control the amount of delay introduced by the delay stages;
a supply voltage pushing compensation circuit stage comprising a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal supply voltage which changes said delay; and
a temperature pushing compensation circuit stage comprising a transconductance stage connected to the multiplexer and arranged to produce a compensating current upon deviation from nominal temperature which changes said delay.
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Specification