Complementary tuned mixer
US6239645A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 1999 |
| Grant date | May 29, 2001 |
| Priority date | — |
| Expiry date | Aug 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0084
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A mixer circuit for frequency conversion operates with low power supply voltage lower than 1 V. The circuit comprises a first pair of N-channel MOS transistors and a second pair of N-channel MOS transistors each receiving differential local frequency signal, and a third pair of P-channel MOS transistors receiving differential radio frequency signal. Each pair of transistors is coupled in series with a parallel resonance circuit which operates as a constant current source. A drain of each transistor of the third pair of transistors is connected to a junction of a first pair and a second pair of transistors and a parallel resonance circuit. An output intermediate frequency signal, which differs between the local frequency and the radio frequency, is obtained at the junction of drains of the first and the second pair of transistors and load resistors. No series connected transistor is inserted between a power source and a ground, and each pair of transistors is inserted between the power source and the ground essentially in parallel with one another.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.