Down conversion filter

Abstract

A down conversion filter with a plurality of sampling capacitor, wherein at least one sampling capacitor is discharged in sampling phases or charge-summing phases of the other sampling capacitors.

Description

technical field [0001] The present invention relates to down conversion filters. Background technique [0002] Figure 1A A conventional down-conversion filter is illustrated in which multiple switched-capacitor circuits are used. Figure 1B List the signal clk in a waveform diagram 1 ~clk N Examples of these signals clk 1 ~clk N responsible for control Figure 1A switch shown. [0003] refer to Figure 1B , signal clk 1 ~clk N It is a periodic signal related to the clock pulse width. signal clk 1 ~clk N The ranges of effects are connected to each other but do not overlap. The length of each action interval (1 / f s ) may be a clock phase. signal clk 1 ~clk N-2 Provide multiple sampling phases and control multiple sampling capacitors C 1 ~C N-2 An input signal (received by the input terminal IN) is sampled in turn. signal clk N-1 Provide a charge summing phase, so that the charge from the sampling capacitor C 1 ~C N-2 Converted to charge summing capacitanc...

AI Technical Summary

Problems solved by technology

Since the number of sampling capacitors is limited by the number of sampling phases, and the adjustable parameters of the down-conversion filter are limited by the number of sampling capacitors, the reserved discharge phases in the traditional technology severely limit the parameter adjustment space of the filter

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