Magnitude and group delay shaping circuit in continuous-time read channel filters
AssigneeLSI Logic Corporation
InventorsNarendra M. K. Rao, Vishnu Balan
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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.
Claims21
A magnitude boost and group delay shaping circuit, comprising:
- a first biquadratic circuit having an input node, a first biquadratic band pass node, and a first biquadratic output low pass node;
- a second boosted biquadratic circuit having a second biquadratic band pass node, a second biquadratic low pass output node, and an input node coupled to said first biquadratic output low pass node;
- a first transconductor coupled between said first biquadratic band pass node and said second biquadratic band pass node;
- and
- a second transconductor coupled between said first biquadratic band pass node and said second biquadratic low pass output node.
A method for providing magnitude boost and group delay shaping, comprising:
- providing a first biquadratic circuit having a first biquadratic input, band pass, and output low pass nodes;
- providing a second biquadratic circuit having a second biquadratic input, band pass, low pass output nodes, the second biquadratic input node coupled to the first biquadratic output low pass node;
- selecting a first transconductance of a first transconductor coupled between said first biquadratic band pass node and said second biquadratic band pass node;
- and
- selecting a second transconductance of a second transconductor coupled between said first biquadratic band pass node and said second biquadratic low pass output node.
Dependencies are inferred from the claim text.