Variable delta voltage tracking regulator and method therefor
US6947774B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 8, 2001 |
| Grant date | Sep 20, 2005 |
| Priority date | — |
| Expiry date | Jul 8, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B15/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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, R2 and 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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.