H - Electricity – 03 – K
Patent
H - Electricity
03
K
354/97
H03K 17/00 (2006.01) H02M 7/53 (2006.01) H03F 3/393 (2006.01) H03K 3/00 (2006.01)
Patent
CA 1193735
"Switchable analogue signal inverter" ABSTRACT: A switchable analogue signal inverter suitable for inverting an input D.C. voltage as required, for example inverting the D.C. voltage from a digital to analogue converter (DAC) and there- by halving the size of the DAC. Essentially the inverter comprises a capacitor having one side alternately switchable between a reference voltage point and an output terminal and another side alternately switchable between the reference voltage point and an input signal terminal and switching means for selectively reversing the phasing of the switching between the reference voltage and the input signal. In one embodiment the inverter comprises a double pole reversing switch having inputs connected to a signal input terminal and to a reference voltage point (ground) and a capacitor connected by a change-over switch to first and second outputs ofthe reversing switch and by another change-over switch to a signal output terminal or to the reference voltage point. The reversing switch is operable in response to a polarity change signal to reverse the signal applied to the first and second outputs and thereby determine the polarity of the voltage pumped by the capacitor to the output terminal by clocking the change-over switches. The switches may be implemented by field effect transistors.
385898
N.v. Philips Gloeilampenfabrieken
Van Steinburg C.e.
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