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A function generator for providing, in analogue, the mantissa of the logarithm of two numbers, given the logarithm of each, may be realised by the conductance of the series combination of a resistor and a semiconductor diode. Its application to a logarithmic digital/analogue convertor for serial inputs is described.
Negative-impedance convertors for lowpass active RC filters must respond down to zero frequency; any attendant drift is unwelcome. A relatively simple circuit is described wherein a balanced input stage feeds an unbalanced output stage, which, in turn, feeds back to both input terminals in the same phase.
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