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专利名称：REFERENCE VOLTAGE SETTING CIRCUIT发明人：KOYABU KUNIHIRO申请号：JP27514387申请日：19871029公开号：JPH01117427A公开日：190510
摘要：PURPOSE:To allow an output potential of a noninverting amplifier to entereasily within a prescribed voltage range by using a code whose hamming distance is '1' asa trimming code. CONSTITUTION:The title circuit consists of a voltage division circuit 94, atrimming circuit 93 and a buffer circuit 92. The voltage division circuit 94 divides a voltageby connecting 2N<-1> sets of resistors Rj (j=1-15) in series between two referencepotentials VA and VB and consists of buffers G01-G04 having complementary outputsand N-channel MOSFETs Q1-Q16, Q101-Q108, Q111-Q114, Q121-Q122 to obtain avoltage division output 51 by giving a potential divided by the resistors Rj to a 1/2Nselection circuit decided by a code whose hamming distance is 1. Thus, all hammingdistances between adjacent codes of a trimming output are '1' and the output voltagegoing to the outside of the voltage range decided due to the deteriorated linearity ofthe noninverting amplifier A01 or the relative accuracy of the resistor is eliminated.
申请人：NEC CORP
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