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Down-conversion using square wave local oscillator signals

A technology of local oscillator and square wave signal, which is applied to improve frequency converters, multi-frequency modulation and transformation, electrical components, etc., and can solve problems such as frequency conversion

Inactive Publication Date: 2012-10-24
TELEFON AB LM ERICSSON (PUBL)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the IF LO is most likely available as a square wave, odd harmonics will cause harmonic downconversion

Method used

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  • Down-conversion using square wave local oscillator signals
  • Down-conversion using square wave local oscillator signals
  • Down-conversion using square wave local oscillator signals

Examples

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Embodiment Construction

[0026] figure 1 The principle of the mixer based on the multiplier circuit 1 is shown. Two signals of different or same frequency, namely the input signal and the local oscillator signal are applied to the multiplier circuit. A mixer presents at its output a mixing of signals having different frequencies, ie the sum of the frequencies of the input signal and the local oscillator signal and the difference between the frequencies of the input signal and the local oscillator signal. When a mixer is used in a receiver for downconversion, the input signal can be a received modulated RF signal or an IF signal that has been downconverted once. In the case of down conversion, the relevant output signal will be a signal with a difference frequency. In a transmitter, the input signal may be a data signal to be modulated onto a local oscillator signal to obtain a modulated radio frequency signal. In this case the relevant output signal will be a signal with a sum frequency.

[0027] ...

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Abstract

In a method of frequency down-converting an input signal to an output signal, a first local oscillator signal is generated as a square wave having a duty cycle of 1 / 3 or 2 / 3, and the input signal is mixed with the first oscillator signal to achieve a first down- converted signal, A second local oscillator signal is generated as a modified square wave having the same period time and a duty cycle of 2 / 3, of which one part has a positive amplitude and another part has a negative amplitude. The input signal is mixed with the second oscillator signal to achieve a second down-converted signal. The first oscillator signal has a delay of 1 / 4 of the period time to achieve a phase shift of Pi / 2 between the oscillator signals, and at least one down-converted signal is multiplied by a pre-calculated factor. The resulting down-converted signals are added to achieve the output signal.

Description

technical field [0001] Embodiments of the invention relate to methods and mixer circuits for downconverting an input signal having a first frequency to an output signal having a second frequency. Background technique [0002] In cellular communication systems there is a rapid development towards higher and higher data rates. To achieve this development, a number of different techniques are employed. One technique is to use higher order modulation, carrying more bits per second per Hertz of bandwidth. Another technique is to use multiple antennas (MIMO) to simultaneously transmit and receive multiple data streams on the same carrier frequency. However, the most important thing is to use wider bandwidth signals. Comparing third generation (3G) Long Term Evolution (3G LTE) (20 MHz) with Global System for Mobile Communications (GSM) (200 kHz), there has been a huge 100-fold increase in bandwidth. However, this is not enough and the next step is to aggregate several LTE Relea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03D7/16H03D7/18
CPCH03D7/18H03D7/165H03D2200/0086
Inventor S.安德森F.蒂尔曼D.埃克贝特I.U.迪恩
Owner TELEFON AB LM ERICSSON (PUBL)
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