Electronic volume
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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N/A
Issued Date -
Jun 1, 2006
app pub date -
Nov 25, 2005
filing date -
Nov 26, 2004
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
To reduce errors due to the on-resistance of the switches. The electronic volume includes a first attenuator 2 whose input is connected to a signal input terminal 1, first switch S1 connected between an output of the first attenuator 2 and input of a output buffer 8, second switch S2 connected to a second attenuator 3 and between an output of the second attenuator 3 and an input of the output buffer 8, and a switching unit 7 connected to three attenuators 4, 5, 6 connected in series to the signal input terminal 1 and between respective outputs of the attenuators 4, 5, 6 and the second attenuator 3. The switch 7 includes a series circuit including a resistor whose one end is connected to the output of the attenuators 4, 5, 6 and the other end is connected to the input of the second attenuator 3 and three switches in series (R1 and S3, R2 and S4, R3 and S5) and a series circuit including a resistor connected in series between the other end of the three switches in series and ground (R4 and S6). Resistors R1 to R4 have the same resistance and switches S1 to S6 have the same on-resistance.
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