Abstract: A low voltage bipolar transconductor circuit with extended dynamic range is disclosed. The transconductance circuit provides a differential current output signal and generally comprises a first and a second differential pair of transistors coupled to a differential input signal and to a load, and having transistors area ratios of 1:r and r:1, respectively. The transconductance circuit further comprises at least one first pair of diodes having positive nodes coupled to each other and to the load, negative nodes coupled to the first differential transistors, and a diode area ratio of r:1, and a least one second pair of diodes having positive nodes coupled to each other and to the load, negative nodes coupled to the second differential transistors, and having a diode area ratio of 1:r.

Abstract: A low power, high performance circuit for magnitude and group delay shaping in continuous-time read channel filters is disclosed. The circuit generally comprises a first and a second biquadratic circuit, each having an input, a band pass, and a output low pass node, where the second biquadratic input node is coupled to the first biquadratic output node, and a first and second transconductor coupled to the first biquadratic band pass node and also to the second biquadratic band pass and low pass output nodes, respectively. The first and second transconductors are preferably programmable transconductors.