Linearized differential amplifier
First Claim
1. A linearized differential amplifier, comprising:
- differential pairs of N (N is an integer of at least three) sets arranged in parallel and each comprising bipolar transistors,means for supplying an equivalent offset voltage to each differential pair;
means for weighting output currents provided from each differential pair; and
means for adding the output current provided from each differential pair,wherein equivalent offset voltages provided to each differential pair are different from each other.
1 Assignment
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Accused Products
Abstract
Disclosed is a linearized differential amplifier, comprising connecting input terminals and output terminals of the differential pairs respectively in parallel; arranging N sets of differential pairs (where N is an integer of at least 3); an offset voltage generating circuit for supplying different and equivalent offset voltages to the respective differential pairs; a circuit for weighting these output currents; and a circuit for adding the output currents. Particularly, the offset voltage generating circuit and the weighting circuit carry out equivalent weighting of the offset voltages and the output currents so that the change of the differential output current corresponding to the change of the differential input voltage shows an equal ripple characteristic. Moreover, to give equivalent offset voltages to the respective differential pairs, a linearized differential amplifier where emitter areas in respective differential pairs are different is disclosed. In this case, the ratio of emitter areas is 1:7.872983 and 1:1 when N is 3, and 1:13.40261 and 1:2.030215 when N is 4.
37 Citations
33 Claims
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1. A linearized differential amplifier, comprising:
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differential pairs of N (N is an integer of at least three) sets arranged in parallel and each comprising bipolar transistors, means for supplying an equivalent offset voltage to each differential pair; means for weighting output currents provided from each differential pair; and means for adding the output current provided from each differential pair, wherein equivalent offset voltages provided to each differential pair are different from each other. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A linearized differential amplifier, comprising:
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differential pairs of three sets arranged in parallel and each comprising bipolar transistors, means for supplying an equivalent offset voltage to each differential pair; means for weighting output currents provided from each differential pair; and means for adding the output currents provided from each differential pair, wherein the equivalent offset voltages are different from each other. - View Dependent Claims (18, 19, 20, 22, 24, 26, 27, 28, 29, 30, 31, 32, 33)
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21. 03·
- 2·
VT for the first differential pair;0.0 for the second differential pair; and -1.03·
2·
VT for the third differential pair(where VT is the thermal voltage expressed by the equation;
VT =kT/q, k=Boltzmann'"'"'s constant, T=absolute temperature, q=electric charge of an electron), andthe ratio of weighting the output currents of the first and the third differential pair to the second differential pair is about 0.64 times. - View Dependent Claims (23, 25)
- 2·
Specification