Variable resistors

Details Variable resistors Variable resistors

H - Electricity

01

C

338/3

H01C 10/08 (2006.01) H03M 1/66 (2006.01) H03M 1/80 (2006.01)

Patent

CA 2006671

- 23 - A B S T R A C T A compact and inexpensive variable resistor has a value of resistance that can be set by a data signal. The variable resistor includes a number of variable resistances connected in series, an an individual electronic switch being connected in parallel across each individual resistance. A latch holds the data signal and controls the switches until a new data signal is received. Each individual resistor includes a resistance of r/x in addition to the basic chosen value of the individual resistance, where x is the total number of electronic switches. Preferably the values of the individual resistances are chosen from the progression 20, 21, 22, 23, and so on, so that the resistance of the variable resistor corresponds to the binary value of data applied to control the electronic switches. At least four such variable resistances can be constructed on a single normal size integrated circuit chip. To minimize the number of connections to the chip, the integrated circuit further includes a shift register and a decoder to supply a selected latch with data from a serial data stream.

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