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Frequency converter, radio receiver

A frequency converter, voltage converter technology, applied in electrical components, modulation transfer, modulation conversion balancing device, etc., can solve problems such as large noise and deterioration of noise characteristics

Inactive Publication Date: 2008-09-24
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, it can be said that the passive double-balanced type CMOS frequency converter is low-noise as its isolated characteristic, but when it is combined with the next-stage analog baseband processing section, the noise characteristic deteriorates as a whole
Also, similarly, when an AD converter such as a delta sigma (ΔΣ) type AD converter is connected at the next stage, since the integrator of its first stage has a configuration similar to that of a current-voltage converter, a large noise

Method used

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  • Frequency converter, radio receiver
  • Frequency converter, radio receiver
  • Frequency converter, radio receiver

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Embodiment Construction

[0018] (Example introduction)

[0019] Embodiments of the present invention will be described with reference to the accompanying drawings, but these drawings are provided for illustrative purposes only and are not intended to limit the present invention.

[0020] As a form of frequency converter, an analog multiplier may have two sets, a first set and a second set of CMOS transistor pairs, which switch complementarily according to changes in one of the first and second signals input as objects of multiplication , and in the analog multiplier, complementary currents may be supplied to the first group of CMOS transistors and the second group of CMOS transistors according to a variation of the other of the first signal and the second signal. That is, a double-balanced type analog multiplier is used.

[0021] Also, as a form, the buffer may be a common gate amplifier. According to the common gate amplifier, the signal input can be made through the current, and the output impedan...

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Abstract

Disclosed is a frequency converter including: a passive type analog multiplier configured to output a multiplication result in a current; a buffer outputting a buffering current by buffering the current of the multiplication result; and a current-voltage converter current-voltage converting the buffering current. Alternately, disclosed is a frequency converter including: a passive type analog multiplier configured to output a multiplication result in a current; a buffer outputting a buffering current by buffering the current of the multiplication result; and an integrator integrating the buffering current to output a voltage.

Description

technical field [0001] The present invention relates to a frequency converter suitable for converting an RF signal to a low frequency with low noise, and to a radio receiver using the frequency converter. Background technique [0002] In recent years, radio terminals have been vigorously developed, and progress has been being made in size reduction and cost reduction thereof. In radio terminals, if RF analog processing is implemented by CMOS ICs such as those used in baseband digital processing sections, CMOS ICs provide a very effective way to achieve size reduction and cost reduction, such as digital / Analog processing. In RF analog processing, since weak signals received by an antenna are demodulated to baseband signals, low-noise characteristics are required for devices including frequency converters. [0003] It is known that when an active double-balanced frequency converter including a CMOS element is used as a frequency converter, a large low-frequency flicker (1 / f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/14H03D7/12H04B1/16
CPCH03D7/1466H03D7/1458H03D7/165H03D7/1441
Inventor 三友敏也伊藤类真木明香
Owner KK TOSHIBA