Battery saving system for a frequency synthesizer

In a digital frequency synthesized portable receiver of the type having a receiver portion and a synthesizer for tuning the receiver including a reference frequency source, a sample and hold phase detector, a voltage controlled oscillator, and a variable frequency divider, a power saving system for selectively supplying power to the receiver and synthesizer, comprising:

• a power source;
• and
• a power saving generator means, coupled between said power source and said synthesizer and receiver portion, and responsive to the hold timing periods of the phase detector to interrupt power to the reference frequency source, and variable frequency divider in synchronism with the establishment of the hold timing periods of the phase detector to conserve power yet maintain the voltage controlled oscillator tuning output without deviation or interruption.

In a digital frequency synthesized portable transceiver of the type having transmitter and receiver portions and a synthesizer for tuning the transceiver including a reference frequency source, a sample and hold phase detector, a voltage controlled oscillator, and a variable frequency divider, a power saving system for selectively supplying power to the receiver and synthesizer, comprising:

• a power source;
• and
• a power saving generator means, coupled between said power source and receiver portion and said synthesizer, and responsive to the hold timing periods of the phase detector to interrupt power to the reference source and variable frequency divider in synchronism with the establishment of the hold timing periods of the phase detector to conserve power yet maintain the voltage controlled oscillator tuning output without deviation or interruption.