Receiver with discrete-time filtering and down-conversion

Inactive Publication Date: 2009-06-25
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Benefits of technology

[0022]Accordingly, the present invention is directed to a receiver with discrete-time filtering and down-conversion, which can moderate the infl

Problems solved by technology

However, the supply voltage may drop, and this may cause the linearly decreasing of an active circuit (e.g. an active amplifier).
On the other hand, although the progress of processing technology results in the decreasing of area of the wireless communication receivers, the ratio of the capacitors to the total area of the wireless communication receiver is hard to reduce, but increase instead.
However, receivers disclosed in the two patents can only achieve the filtering effect on narrowband signals, and the folding noises generated during sampling and down-conversion will lead to the decrease of the performance of the entire system.
However, the switched-capacitor network 14 may generate a first order infinite impulse response (first order IIR) at the load capacitor CA, and thus the receiver 10 can only be used to filter and

Method used

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Example

[0043]Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.

[0044]In order to solve the problems of the interference and influence of the folding noises generated by a conventional receiver during signal down-conversion, a receiver with discrete-time filtering and down-conversion is provided in an embodiment of the present invention. Different from conventional receiver, the signal generated by the receiver after down-converting the radio frequency signal does not have the severe problem of folding noises. In other words, the receiver in the embodiment of the present invention can reduce the power of the folding noises at certain frequencies, thus having a better performance than the conventional receiver.

[0045]FIG. 9A is a system block diagram of a receiver 40 according

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Abstract

A receiver with discrete-time filtering and down-conversion is provided. The receiver includes a mixer and a sampling-and-filtering device. The sampling-and-filtering device is coupled to the mixer. The mixer receives a first radio frequency signal, and then mixes the first radio frequency with a reference signal to generate a first signal. The first signal is a continuous-time signal. The sampling-and-filtering device sequentially samples, filters, and down-converts the first signal according to a clock signal to generate a second signal.

Description

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Claims

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Application Information

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Owner IND TECH RES INST
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