Single-ended to differential converter

Details Single-ended to differential converter Single-ended to differential converter

1998-02-17

1999-08-31

Lee, Benny

Amplifiers

With semiconductor amplifying device

Including balanced to unbalanced circuits and vice versa

327359, H03F 304, G06F 744

Patent

active

059458780

ABSTRACT:
A single-ended to differential converter (400, 500) has an input terminal (418, 518) which is adapted to be coupled to an inductance (412, 512). A first transistor (402, 502) which terminates an input signal received at the input terminal according to its transconductance has a first current electrode coupled to the input terminal. A second current electrode of the first transistor (402, 502) outputs one current of a differential output current. A second transistor (404, 504) has a control electrode coupled to the input terminal, a first current electrode coupled to a signal ground terminal, and a second current electrode for providing another current of the differential output current. Bias circuits bias the control electrodes of the first (402, 502) and second (404, 504) transistors to maintain the same DC currents through their current electrodes. The single-ended to differential converter (400, 500) reflects the noise produced by the first transistor (402, 502) in the second transistor (404, 504), and this common-mode noise can be rejected in a subsequent stage.

REFERENCES:
patent: 4268916 (1981-05-01), Kusakabe
patent: 4885550 (1989-12-01), Ferrer
patent: 5049831 (1991-09-01), Westwick
patent: 5283484 (1994-02-01), Brehmer et al.
patent: 5497123 (1996-03-01), Main et al.
patent: 5825231 (1998-10-01), Chevallier et al.

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