| 摘要 |
PCT No. PCT/FI90/00123 Sec. 371 Date Nov. 8, 1991 Sec. 102(e) Date Nov. 8, 1991 PCT Filed May 7, 1990 PCT Pub. No. WO90/13938 PCT Pub. Date Nov. 15, 1990.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.
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