Miscellaneous active electrical nonlinear devices – circuits – and – Specific input to output function – Combining of plural signals
Patent
1993-08-20
1998-10-20
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific input to output function
Combining of plural signals
327359, H03D 714
Patent
active
058252312
ABSTRACT:
An integratable transformer circuit for converting an asymmetrical input signal into a pair of symmetrical output signal currents and requiring only one IC connection pin. The circuit exhibits a low input impedance combined with good noise, gain and intermodulation performance up to high frequencies. The asymmetrical input terminal of the circuit is coupled to a node commonly coupled to the emitter of a common base transistor and to the base of a common emitter transistor. The common base transistor acts as a non-inverting current follower, the common emitter transistor as an inverting transimpedance amplifier. An input signal current is transferred to a first symmetrical output terminal via the node and the common base transistor, thereby producing a signal voltage at the node. This signal voltage modulates the collector current of the common emitter transistor, which is in phase opposition to the input signal current and is transferred to the second output terminal.
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Search Report.
Chevallier Gilles
Stikvoort Eduard F.
Blocker Edward
Callahan Timothy P.
Lam T. T.
U.S. Philips Corporation
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