Mixer with cross-connected symmetrical subcircuit couplings
US6026287A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 1997 |
| Grant date | Feb 15, 2000 |
| Priority date | — |
| Expiry date | Sep 19, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H7/18
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A converter, transmitter and/or receiver for mixing an input signal (I.sub.RF) having a first frequency (RF) with an input signal (I.sub.LO) coming from a local oscillator having a second frequency (LO), and for producing an output signal (O.sub.IF) having an intermediate frequency (IF), with rejection of the harmonics of the second frequency (LO) up to a very high order, for example, higher than the tenth order. The device includes a double balanced ring mixer (17) of field effect transistors (12, 13, 14, 15), having a first and a second pair of input terminals (3, 4; 1, 2) and having a pair of output terminals (5, 6), and a first and a second coupler (18, 19) respectively acting as a phase separator and phase combiner for the input signal (I.sub.RF) having the first frequency (RF) and output signal (O.sub.IF) having the intermediate frequency (IF), connected to the first pair of input terminals (3, 4) and to the pair of output terminals (5, 6) respectively, of the ring mixer (17), and each formed by a first and second identical passive phase shifter circuit (300, 400; 500, 600) including isolated elements, and arranged symmetrically so that the respective impedances on the termin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.