Patent ID: 6104332
Filing Date: 2000-08-15
Classification: H03F,H03K,H03M

Abstract:
An absolute value circuit for use in analog measurement apparatus, said circuit comprising:a polarity detector configured to provide a polarity signal indicative of a polarity of a bipolar differential analog input signal having a first analog component and a second analog component;an absolute value converter having first and second inputs which receive the first and second analog components, respectively, of the differential analog input signal and first and second outputs, with the absolute value converter operating to couple the first input to the first output and the second input to the second output when the polarity signal is in a first state and operating to couple the first input to the second output and the second input to the first output when the polarity signal is in a second state, different than the first state; andanalog processing circuitry configured to process an analog signal of a single polarity, with the analog processing circuity coupled to the first and second outputs of the absolute value circuit converter.