Patent ID: 6665528
Filing Date: 2003-12-16
Classification: H03D

Abstract:
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.