Patent ID: 6892061
Filing Date: 2005-05-10
Classification: H03C,H03D

Abstract:
1. A circuit configuration for mixing a desired signal with an oscillator signal, comprising: terminals for the desired signal to be supplied with a first signal component and a complementary second signal component of the desired signal; terminals for the oscillator signal to be supplied with a first signal component and a complementary second signal component of the oscillator signal; first and second difference amplifiers each including a coupling node and first and second branches, said branches each having first and second terminals and a transistor; resistors each having a first terminal connected to said first terminal of a respective one of said branches and a second terminal connected to a respective one of said coupling nodes, and current sources each connected between a respective one of said coupling nodes and a terminal for a reference potential; said transistors of said first branches of said difference amplifiers having control terminals controlled by the first component of the desired signal, and said transistors of said second branches of said difference amplifiers having control terminals controlled by the second component of the desired signal; load elements each connecting said second terminal of said first branch of one of said difference amplifiers and said second terminal of said second branch of another of said difference amplifiers together to a terminal for a supply potential; and additional transistors each to be controlled by a respective one of the signal components of the oscillator signal, said additional transistors each connected between the terminal for the supply potential and said first terminal of a respective one of said resistors of said branches of said difference amplifiers.