Unbalance-to-balance converter utilizing a transistor

Wave transmission lines and networks – Coupling networks – Balanced to unbalanced circuits

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327257, 330301, H03H 1132

Patent

active

060941081

ABSTRACT:
An unbalance-to-balance converter includes an FET and a balanced output adjusting capacitor connected between the source terminal of the FET and an earth conductor. The balanced output adjusting capacitor has a capacitance value equal to a capacitance difference Cpd-Cps between a drain side parasitic capacitance Cpd and a source side parasitic capacitance Cps. This makes it possible to solve a problem involved in a conventional unbalance-to-balance converter in that when the drain side parasitic capacitance Cpd differs from the source side parasitic capacitance Cps, a pair of balanced signals output from the drain terminal and source terminal do not have the same amplitude and are not in complete opposition.

REFERENCES:
patent: 5039891 (1991-08-01), Wen et al.
patent: 5821815 (1998-10-01), Mohwinkel

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