Signal-controllable attenuator employing a digital-to-analog...

Details Signal-controllable attenuator employing a digital-to-analog... Signal-controllable attenuator employing a digital-to-analog...

H - Electricity

04

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330/107, 179/40

H04R 3/00 (2006.01) G06F 5/00 (2006.01) H03G 3/00 (2006.01) H03H 11/24 (2006.01) H03M 1/00 (2006.01)

Patent

CA 1142445

IMPROVED SIGNAL-CONTROLLABLE ATTENUATOR EMPLOYING A DIGITAL-TO-ANALOG CONVERTER ABSTRACT OF THE DISCLOSURE A signal-controllable attenuator comprising a 17-bit multiplying-type digital-to-analog converter having an R/2R ladder network to set the bit weights, and controlled by a 6-bit remotely-generated command signal to vary the attenuation in steps of 1.5 dB through arrange of 88 dB. The 1.5 dB steps are controlled by a 4-bit code signal responsive to two bits of the command signal. The 4-bit code signal is directed to four successive bit input terminals of the converter. Which four DAC input terminals are selected is controlled by a shifting matrix which shifts the four bits along the DAC input terminals to a position determined by the other four bits of the command signal.

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