System and method for level shifting signals with adjustably controlled frequency response

摘要

A system and method are provided for level shifting signals generated by an electronic circuit with selectively controlled frequency response. A first circuit portion defines a primary path for a signal within an upper region of a predefined signal frequency range, and includes a first capacitor unit establishing a voltage level shift for a signal passing therethrough. A second circuit portion selectively defines a secondary path bypassing the primary path for a signal within a lower region of the predefined signal frequency range, and includes a switched capacitive section disposed in parallel across the first capacitor unit to establish a voltage level shift for the signal passing therethrough. A second capacitor unit charges substantially to a predetermined shift voltage in a charging phase and couples to the first capacitor unit during a transfer phase. An attenuation adjust unit adjustably augments a parasitic capacitance of the first or second circuit portion.

主权项

1. A system for level shifting signals provided by an electronic circuit with selectively controlled frequency response, comprising:
a first circuit portion defining a primary path for an intermediate signal generated by the electronic circuit within an upper region of a predefined signal frequency range, said first circuit portion including a first capacitor unit establishing a voltage level shift for the intermediate signal when passed through said primary path; a second circuit portion selectively defining a secondary path bypassing said primary path for an intermediate signal generated by the electronic circuit within a lower region of the predefined signal frequency range, said second circuit portion establishing a voltage level shift for the intermediate signal when passed through said secondary path, said second circuit portion including a switched capacitive section disposed in parallel across said first capacitor unit and selectively actuated in mutually exclusive charging and transfer phases, said switched capacitive section having a second capacitor unit charged substantially to a predetermined shift voltage in said charging phase and coupled to said first capacitor unit during said transfer phase; and, at least one attenuation adjust unit coupled to one of said first or second circuit portions, said attenuation adjust unit being selectively configured in capacitance for adjustably augmenting a parasitic capacitance of said first or second circuit portion; wherein said switched capacitive section includes a cross-over unit coupled to said second capacitor unit and activated based on a predetermined switching frequency to establish a cross-over frequency delineating said upper and lower regions of the signal frequency range.