Cascode oscillator having optimum phase noise and bandwidth performance
US5621362A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 5, 1996 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Feb 5, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03B5/1243
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An oscillator (100) includes a tank circuit (102) coupled to a an active circuit (108). The feedback (104) provides the necessary feedback between the tank and the active circuit necessary for oscillation. The active circuit (108) is biased via a biasing circuit (106) and coupled out to a load via an external coupling (110). The active circuit (108) includes two transistors (124, 126) coupled to each other in a cascode configuration. Transistor (126) provides the collector current for transistor (124) while preventing it from entering saturation prematurely. The biasing circuit (106) provides sufficient current drain for the transistor (126) in order to provide for optimum phase noise and bandwidth performance of the oscillator 100.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.