US 2010/0167669 A1 · DISCRETE FILTER, SAMPLING MIXER, AND RADIO DEVICE

Abstract

Provided is a discrete filter capable of adjusting the number of notches and the notch frequency and easily eliminating a particular frequency component. In a sampling mixer (100), a control signal generation unit (104) generates a plurality of control signals having the same frequency and different phases. A convolution capacity unit (110) integrates the discrete signals obtained by sampling reception signals by using convolution capacitors at a timing based on the control signals. The signals integrated by the convolution capacitors are successively emitted at the timing based on a control signal other than the control signals used for the integration timing. Cb (15) integrates the emitted discrete signals. Thus, by adjusting the number of the convolution capacitors arranged in parallel to one another and the capacitance of each of the convolution capacitors, it is possible to realize a sampling mixer capable of adjusting the number of notches and the notch frequency and easily eliminating a particular frequency component.

Claims16

Dependent claims

A discrete filter comprising:

a control signal generator that generates a plurality of control signals of a same frequency and varying phases;
a convolution capacity section that receives as input a received signal;
a buffer capacitor that integrates a discrete signal released from the convolution capacity section, wherein:
the convolution capacity section includes m+1 integration units including m integration elements connected in parallel (where m is a natural number of two or more);
all of the m integration elements included in one integration unit selected from the m+1 integration units integrate the received signal at a same timing based on the control signals;
and
an integration element selected one by one from the m integration units other than the selected one integration unit, outputs a signal integrated earlier at a same timing at which the received signal is integrated.

4 more elements

A discrete filter comprising:

a first convolution capacity section that comprises m+1 integration units which comprises m integration elements connected in parallel and integrating a received signal (where m is a natural number of two or more) and which are connected in parallel;
a second convolution capacity section that has a same configuration as the first convolution capacity section and that receives as input a received signal of a phase opposite to the received signal inputted to the first convolution capacity section;
and
a first buffer capacitor and a second buffer capacitor that integrate signals released from the first convolution capacity section and the second convolution capacity section, wherein:
each integration unit of the first convolution capacity section releases the received signal integrated in the m integration elements to the second buffer capacitor at specific release timings out of m release timings associated with the m integration elements, and releases the received signal to the first buffer capacitor at release timings other than the specific release timings;
and
each integration unit of the second convolution capacity section releases the received signal integrated in the m integration elements to a buffer capacitor opposite to the integration units of the first convolution capacity section at same release timings as the integration units of the applicable first convolution capacity section.

4 more elements

Dependencies are inferred from the claim text.

Discrete filter, sampling mixer, and radio device

Life of this patent

Discrete filter, sampling mixer, and radio device

Life of this patent

Abstract

Claims16