Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Patent
1988-10-17
1990-09-04
Eisenzopf, Reinhard J.
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
455183, 455343, H03L 700, H03L 706
Patent
active
049550756
ABSTRACT:
A radio receiver (102) receives on a selected one of a plurality of channels, one of which is a control channel. A continuous signal is transmitted on the control channel. A frequency synthesizer (122) includes a voltage controlled oscillator (VCO 124) and a plurality of phase lock circuits (126), such as a phase detector (130), a reference oscillator (134), a programmable divider (128) and a loop filter (132). The input of the VCO can be switched between the phase lock circuits and an automatic frequency control circuit (AFC 114), which is connected to the radio receiver. When the radio receiver is receiving a quality control channel signal, the switch is positioned to select the AFC circuit and, consequently, the VCO is frequency locked to the control channel signal. Whenever the VCO is locked to the control channel signal, one or more of the phase lock circuits are deactivated, thereby reducing power consumption. When the radio receiver is tuned to a channel other than the control channel, the VCO is phase locked to the reference oscillator by activating the phase lock circuits and positioning the switch such that the VCO input is coupled to the phase lock circuits.
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Microelectronics, Jacob Millman, PH.D., Arvin Grabel, Second Edition, pp. 110-114, and 156-160.
Buchenhorner Michael J.
Charovel Lisa
Eisenzopf Reinhard J.
Motorola Inc.
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