Efficient AC coupled CMOS RF amplifier
US6570450B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 2001 |
| Grant date | May 27, 2003 |
| Priority date | — |
| Expiry date | Apr 2, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03F1/308
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
Disclosed is a CMOS transistor amplifier for small RF signals which operates in a Class AB mode. The serially connected P channel and N channel transistors of the CMOS transistor pair have DC bias voltages applied to the control gates, and the small input signal is capacitively coupled to the gates of the CMOS transistor pair. In a preferred embodiment, the DC voltage bias for the P channel transistor is derived from a second P channel transistor which is approximately identical to the first P channel transistor in structure with the second P channel transistor serially connected with the current source and the voltage at the gate/drain of the transistor resistively coupled to the gate of the first P channel transistor. Similarly, the second bias circuit comprises a second N channel transistor which is approximately identical in structure to the first N channel transistor with the second N channel transistor serially connected with a current source and the bias voltage taken at the gate/drain of the second N channel transistor. The bias voltage is then applied through resistive means to the gate of the first N channel transistor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.