Voltage step up regulator
First Claim
1. A step-up generator for generating a frequency control signal for a frequency synthesizer, said step-up generator comprising:
- means for receiving an externally provided source operating voltage, said frequency control signal having a dc voltage higher than said source operating voltage;
dc level shifting means for raising a dc level of an amplified reference oscillator signal output from said class A amplifying means;
means for rectifying and filtering an output from said dc level shifting means to generate said frequency control signal; and
feedback means for stabilizing said frequency control signal by controlling an amplification bias of said class A amplifying means.
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Accused Products
Abstract
A voltage step-up regulator produces a frequency control voltage for a frequency synthesizer in a radio transmitter using a low operating voltage. To minimize the disturbances conveyed elsewhere in the radio device, the step-up regulator comprises an amplifying transistor controlled by an oscillator signal which operates as a class A amplifier, the output of amplifying transistor (Q1) including a diode and two selectively coupled capacitors for rectifying and filtering the amplified signal. The step-up regulator further comprising a feedback circuit for stabilizing the output voltage by adjusting the amplitude of the amplified signal.
9 Citations
9 Claims
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1. A step-up generator for generating a frequency control signal for a frequency synthesizer, said step-up generator comprising:
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means for receiving an externally provided source operating voltage, said frequency control signal having a dc voltage higher than said source operating voltage; dc level shifting means for raising a dc level of an amplified reference oscillator signal output from said class A amplifying means; means for rectifying and filtering an output from said dc level shifting means to generate said frequency control signal; and feedback means for stabilizing said frequency control signal by controlling an amplification bias of said class A amplifying means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification