Time division multiple access time division duplex type transmit

Multiplex communications – Duplex – Communication over free space

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Details

375375, 375376, 327156, 331 25, 370347, H03L 706

Patent

active

055984053

ABSTRACT:
A transmitter-receiver of the TDMA/TDD type which includes a phase control loop controlled in such a manner that the loop is turned on during the time slot just preceding each of a transmission time slot and a reception time slot, and the loop is turned off during all other time periods including the transmission time slot and the reception time slot. The voltage controlled oscillator includes a variable capacitance diode which produces an output frequency in response to a frequency control voltage received from a charge pump when the loop is closed, and in response to a charging voltage supplied from a loop filter when the loop is open. When the loop is closed, a phase comparator compares a reference frequency signal with an output frequency signal of the voltage-controlled oscillator and generates error signals for controlling the charge pump. A state switching unit switches the state of the phase comparator between an operating state, when the loop is closed, and a stand-by state in response to a power saving signal when the loop is open. A bias supply unit applies a variable bias voltage to an anode of the variable capacitance diode. The variable bias voltage varies in nearly the same manner as the charging voltage supplied to a cathode of the variable capacitance diode from the loop filter when the phase comparator is in a stand-by state, thereby maintaining the voltage across the variable capacitance diode at a relatively constant level such that the output frequency signal is maintained at a desired level.

REFERENCES:
patent: 4083015 (1978-04-01), Popodi
patent: 5123008 (1992-06-01), Beesley
patent: 5140286 (1992-08-01), Black et al.
patent: 5153530 (1992-10-01), Takagi et al.
patent: 5175511 (1992-12-01), Fujiwara
patent: 5230088 (1993-07-01), Kramer
patent: 5337010 (1994-08-01), Nishiyama
patent: 5339309 (1994-08-01), Saito
patent: 5465400 (1995-11-01), Norimatsu
patent: 5521947 (1996-05-01), Madsen

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