Texas Instruments Corporation

Srinivasan Venkatraman

William H Giolma

Richard C Pierson

A capacitor current sensing circuitry (100) for sensing the current through a bandpass capacitor (20) of a first biquad stage (80) and generating an output current in response. The capacitor current sensing circuitry (100) includes a differential input circuit comprising a transistor (123) and a transistor (124), a fixed current source (130), a variable current source (120), a variable current, source (122), an input current sink (126), a differential output circuit comprising a transistor (132) and a transistor (134), and a programmable output current sink (138). The differential input circuit receives an input sense voltage and generates a first input current, a second input current, a first output voltage, and a second output voltage in response. The fixed current source (130) generates a current that is used to provide a first current component to the first input current and a first current component to the second input current. The variable current source (120) and the variable current source (122) generate a second component of the first input current and the second input current, respectively. The input current sink (126) receives the first input current and the second input current. The transistor (132) receives the first output voltage and generates a first output current in response, while the transistor (134) receives the second output voltage and generates a second output current in response. The programmable output current sink (138) receives the first output current and the second output current.

Circuitry and method for providing boost and asymmetry in a

A charge pump (10) having a current source (12) and a current sink (14) is provided. Current source (12) generates one of two output currents using current mirror (16) and switch (18). Switch (18) selects between the two outputs based on a signal from source control (20). Current sink (14) generates one of two currents using current mirrors (44) and (46), and switch (48). Switch (48) selects from two currents generated by current mirrors (44) and (46).

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Bengaluru, India

Srinivasan Venkatraman