Mixer with improved linearity
AssigneeAnalog Devices Global
InventorsMohamed Moussa Ramadan Esmael, Mohamed Mobarak
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Abstract
Mixers with improved linearity are disclosed. A diode or FET ring mixer is implemented with at least one parallel shunt element coupled with the ring mixer, the shunt element providing shunt to a diode or FET, for example, to reduce the effect of nonlinear or off resistance and/or capacitance. Linearity, isolation, symmetry, even order harmonics of the ring mixer, or any combination thereof can be improved as a result. The linearity of the ring mixer with parallel shunt resistors can be further improved by adding series resistors in the ring according to certain embodiments.
Claims20
A mixer comprising:
- switching circuit elements comprising a first switching element and a second switching element arranged in a ring;
- and
- shunt elements comprising a first shunt element and a second shunt element,
- wherein the first shunt element is coupled in parallel with the first switching circuit element and the second shunt element is coupled in parallel with the second switching circuit element,
- wherein the plurality of switching circuit elements are switched on and switched off based at least in part on a local oscillator signal received by the switching circuit elements, and
- wherein the mixer is configured to mix an input signal with the local oscillator signal to thereby frequency shift the input signal.
A mixer comprising:
- diodes comprising a first diode and a second diode;
- and
- linear circuit elements comprising a first linear element and a second linear element,
- wherein the first linear element is coupled in parallel with the first diode and the second linear element is coupled in parallel with the second diode,
- wherein the diodes are switched on and switched off based at least in part on a local oscillator signal received by the diodes, and
- wherein the mixer is configured to mix an input signal with the local oscillator signal to thereby frequency shift the input signal.
A mixer comprising:
- diodes arranged in a ring;
- resistors, each of which is arranged in parallel with a respective diode of the diodes arranged in the ring;
- a first balun configured to receive a local oscillator signal, the first balun being electrically coupled to a first node between two of the diodes arranged in the ring;
- a second balun configured to receive an input signal, the second balun being electrically coupled to a second node between one of the two diodes and another of the diodes arranged in the ring,
- wherein the mixer is configured to mix the input signal with the local oscillator signal to thereby frequency shift the input signal, and
- wherein the diodes arranged in the ring and the resistors are implemented on a single die.
Dependencies are inferred from the claim text.