H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/21
H03F 3/45 (2006.01)
Patent
CA 1219045
ABSTRACT: Amplifier with rail-to-rail input capability and controlled transconductance. A differential amplifier operable between a pair of supply voltages that define a rail-to-rail supply range contains a pair of differential portions (20 and 22) that together provide representative signal amplification across the supply range, although neither differential portion individually does so. A current control (24) regulates operating currents (IN and Ip) for the differen- tial portions in such a way that the amplifier transcon- ductance can be controlled in a desired manner as the common-mode part (VCM) of the amplifier input signal (VI+ and VI-) varies across the supply range. The trans- conductance is typically controlled to be largely con- stant. A summing circuit (26) selectively combines inter- nal currents (IA, IB, IC, and ID) from the differential portions to generate at least one output signal (IO+ and IO-) representative of the input signal.
479475
Huijsing Johan H.
Van de Plassche Rudy J.
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
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