Variable resistance circuit, oscillator circuit, and semiconductor device
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United States of America Patent
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Jul 14, 2020
Grant Date -
Aug 29, 2019
app pub date -
Feb 25, 2019
filing date -
Feb 26, 2018
priority date (Note) -
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Abstract
Provided is a variable resistance circuit in which the resistance value of the variable resistance circuit can be accurately adjusted, by reducing the error in the change amount of the resistance value of the variable resistance circuit due to the on-resistances of switch circuits even if the switch circuits that each bypass a resistor included in a ladder resistor circuit are switched between an OFF state and an ON state. This variable resistance circuit includes: a ladder resistor circuit including a plurality of resistors; a first switch circuit connected in series to one end of one resistor of the plurality of resistors; and a second switch circuit connected in parallel to a series circuit of the one resistor and the first switch circuit. When one of the first and second switch circuits is turned on, the other of the first and second switch circuits is turned off.
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