| 摘要 |
PROBLEM TO BE SOLVED: To provide an image rejection mixer having a high image rejection ratio. SOLUTION: The mixer comprises a cascode amplifier 10 with input of a local oscillation signal from a local oscillator 3, a polyphase filter 11 for generating a first and second local oscillation signals with a phase difference of 90°from each other, based on an output signal from the cascode amplifier 10, and means (resistors R4-R7) for feeding bias voltages to connection nodes of the polyphase filter 11 and capacitors C1, C2. The polyphase filter 11 is connected via resistors R8-R11 to terminals 12-15 connected to a mixer (not shown), and the cascode amplifier 10 is connected via the capacitors C1, C2 to the polyphase filter 11. COPYRIGHT: (C)2003,JPO
|
