Variable delta voltage tracking regulator and method therefor

Details Variable delta voltage tracking regulator and method therefor Variable delta voltage tracking regulator and method therefor

2005-09-20

2005-09-20

Cumming, William (Department: 2683)

Telecommunications

Transmitter and receiver at same station

Radiotelephone equipment detail

C331S11300A

Reexamination Certificate

active

06947774

ABSTRACT:
A telematics communication system (100) receives an input supply voltage (Vin) (122) from a battery (102) charged by an alternator (101) in an automotive vehicle. The telematics communication system (100) includes a transceiver (104) having a transmitter (107) and a variable delta voltage tracking regulator (VDVTR) (109). The VDVTR (109) provides a regulated output supply voltage (Vout) (124) to a power amplifier (114) in the transmitter (107) responsive to the input supply voltage (122) and a regulator control voltage (TX_EN) (123). The VDVTR (109) has a first operating stage and a second operating stage, each controlled by a bias circuit (R1,R2and R3), and a third operating stage, controlled by a voltage limiting circuit (D1) to eliminate alternator whine noise (405) that appears on the input supply voltage (122) and, in turn, appears on the regulated output supply voltage (Vout) (124).

REFERENCES:
patent: 4584517 (1986-04-01), Schwob
patent: 4825144 (1989-04-01), Alberkrack et al.
patent: 4882531 (1989-11-01), Edwards et al.
patent: 5442317 (1995-08-01), Stengel
patent: 5506493 (1996-04-01), Stengel
patent: 5604466 (1997-02-01), Dreps et al.
patent: 2002/0128049 (2002-09-01), Davis

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