Dual band fet mixer
AssigneeInfineon Technologies North America Corp.
InventorsBrian J. McNamara, Heinz Banzer, Ludger Verweyen
Life of this patent
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Abstract
A dual band mixer has a common node for at least one radio frequency input and an intermediate frequency output. The dual band mixer also has a first transistor with a gate coupled to a first local oscillator input and a drain coupled to the common node, and a second transistor with a gate coupled to a second local oscillator input and a drain coupled to the common node. Interconnection circuitry turns off the second transistor when the first local oscillator input signal is applied to the first transistor, and turns off the first transistor when the second local oscillator input signal is applied to the second transistor.
Claims11
A dual band mixer, comprising:
- a common node for a first radio frequency input, a second frequency input and an intermediate frequency output, the first radio frequency input to receive a first radio frequency input signal, the second radio frequency input to receive a second radio frequency input signal, the first radio frequency input signal operating at a different radio frequency band than the second radio frequency input signal;
- a first transistor having a gate coupled to a first local oscillator input and a drain coupled to the common node;
- a second transistor having a gate coupled to a second local oscillator input and a drain coupled to the common node;
- interconnection circuitry coupling the first transistor and the second transistor;
- and
- a switch to direct one of the first radio frequency input or the second radio frequency input to the common node, wherein
- while the first radio frequency input is directed to the common node, a first local oscillator applies a first local oscillating signal to the gate of the first transistor through the first local oscillator input and the interconnection circuitry turns off the second transistor,
- while the second radio frequency input is directed to the common node, a second local oscillator applies a second local oscillating signal to the gate of the second transistor through the second local oscillator input and the interconnection circuitry turns off the first transistor.
A method of mixing in a dual band mixer, comprising:
- providing a first radio frequency input and a second radio frequency input to a common node, the first radio frequency input to receive a first radio frequency input signal, the second radio frequency input to receive a second radio frequency input signal, the first radio frequency input signal operating at a different radio frequency band than the second radio frequency input signal, the common node being coupled to drains of a first transistor and a second transistor;
- directing one of the first radio frequency input or the second radio frequency input to the common node,
- while the first radio frequency input is directed to the common node, driving a gate of the first transistor with a first local oscillator input and turning off the second transistor;
- while the second radio frequency input is directed to the common node, driving a gate of the second transistor with a second local oscillator input and turning off the first transistor;
- and
- sensing an intermediate frequency output from the common node.
Dependencies are inferred from the claim text.