Method and circuit for compensation control of offset voltages of a radio receiving circuit integrated in a circuit module
US6476593B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 3, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Jan 20, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/28
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A method and circuit for compensation control of offset voltages of a radio receiving circuit integrated in a circuit module that can be used in receiver and transceiver chips for portable mobile radio transceivers, for example in GSM or PCN/PCS systems. In the course of offset voltage compensated in the baseband of a radio receiver, the charge state of a capacitor, which is switched on in a sample-and-hold circuit by predetermined, constant control pulses is evaluated on-chip. The evaluation result is used to match the charging current of a sample operational amplifier to the respective charge state of the capacitor, thereby achieving a minimal compensation time with stable regulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.