Double balanced FET mixer with high IP3 and IF response down to DC levels
OwnerDoron Gamlielinventor
Life of this patent
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Abstract
A double balanced FET mixer that has a high third order intercept point and an intermediate frequency response that goes to direct current levels. The mixer includes a local oscillator terminal, a RF terminal and an intermediate frequency terminal. The mixer has a pair of field effect transistors. Each field effect transistor has a gate, a drain and a source electrode. The source electrodes of the first and second transistors are connected together. A first balun transformer is connected between the local oscillator terminal and the gates. A second balun transformer is connected between the drains and the RF terminal and the intermediate frequency terminal.
Claims29
A double balanced mixer for mixing an RF input signal with a local oscillator signal to provide at an output an intermediate frequency signal with a high third order intercept point and an intermediate frequency response down to direct current levels, comprising:
- a) a local oscillator terminal, an RF terminal and an intermediate frequency terminal;
- b) a pair of field effect transistors each having a gate, a drain and a source electrode, the source electrodes of the first and second transistors connected together;
- c) a first balun transformer connected between the local oscillator terminal and the gates;
- and
- d) a second balun transformer connected between the drains and the RF terminal and the intermediate frequency terminal.
A double balanced mixer for mixing an RF input signal with a local oscillator signal to provide at an output an intermediate frequency signal with a high third order intercept point and an intermediate frequency response down to direct current levels, comprising:
- a) a local oscillator terminal, an RF terminal and an intermediate frequency terminal;
- b) a first, second, third and fourth field effect transistor, each transistor having a gate, a drain and a source electrode, the source electrodes of the first and third transistors connected together and to ground, the source electrodes of the second and third transistors connected together;
- c) a first balun transformer connected between the local oscillator terminal and the gate electrodes of the first, second third and fourth transistors;
- and
- d) a second balun transformer connected between the drain electrodes of the first, second, third and fourth transistor and the RF terminal and the intermediate frequency terminal.
A double balanced mixer, comprising:
- a) a local oscillator terminal, an RF terminal and an intermediate frequency terminal;
- b) a first field effect transistor having a first gate, a first drain and a first source;
- c) a second field effect transistor having a second gate, a second drain and a second source, the first and second sources connected together to a ground;
- d) a local oscillator balun transformer connected between the local oscillator terminal and the gates;
- e) an intermediate frequency balun transformer connected between the drains and the intermediate frequency terminal;
- and
- f) a RF balun transformer connected between the drains and the RF terminal.
A double balanced mixer having a local oscillator terminal for receiving a local oscillator signal, an RF terminal for receiving an RF signal and an intermediate frequency terminal for providing an intermediate frequency signal, the double balanced mixer comprising:
- a) a first and second pair of parallel connected field effect transistors each having a gate, a drain and a source;
- b) the sources of the first pair of transistors connected together to a ground;
- c) the sources of the second pair of transistors connected together;
- d) a local oscillator balun transformer connected between the local oscillator terminal and the gates;
- e) an intermediate frequency balun transformer connected between the drains and the intermediate frequency terminal;
- and
- f) a RF balun transformer connected between the drains and the RF terminal.
Dependencies are inferred from the claim text.