Positive temperature coefficient bias compensation circuit
US10439563B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 28, 2018 |
| Grant date | Oct 8, 2019 |
| Priority date | — |
| Expiry date | Feb 28, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03G2201/708
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Temperature compensation circuits and methods for adjusting one or more circuit parameters of a power amplifier (PA) to maintain approximately constant Gain versus time during pulsed operation sufficient to substantially offset self-heating of the PA. Some embodiments compensate for PA Gain “droop” due to self-heating using a Sample and Hold (S&H) circuit. Other embodiments include bias compensation circuits that directly regulate a bias signal to an amplifier stage as a function of localized heating of one or more of amplifier stages. Such bias compensation circuits include physical placement of at least one bias compensation circuit element in closer proximity to at least one amplifier stage than other bias compensation circuit elements. One bias compensation circuit embodiment includes a temperature-sensitive current mirror circuit for regulating the bias signal. Another bias compensation circuit embodiment includes a temperature-sensitive element having a positive temperature coefficient (PTC) for regulating the bias signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.