Unlock instant, AI-driven research and patent intelligence for your innovation.

Apparatus comprising a sigma-delta modulator and method of generating a quantized signal-delta modulator

A technology of incremental modulation and signal modulation, which is applied in the equipment field of accumulative incremental modulators, and can solve problems such as unsatisfactory performance

Active Publication Date: 2009-09-09
TELEFON AB LM ERICSSON (PUBL)
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The receiver will not work optimally in frequency modulation mode if a summing delta modulator is used with a dithered signal applied to the input, and on the other hand if a dithered signal is used with a quantized phase modulation mode would not be optimal since the SDM would have to be designed for one of the two modes, and the result would be in the other. Unsatisfactory performance in mode

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Apparatus comprising a sigma-delta modulator and method of generating a quantized signal-delta modulator
  • Apparatus comprising a sigma-delta modulator and method of generating a quantized signal-delta modulator
  • Apparatus comprising a sigma-delta modulator and method of generating a quantized signal-delta modulator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0036] Attached figure 1 A schematic diagram of the frequency synthesizer 1 controlled by the accumulative increment that can apply the present invention is shown in FIG. The synthesizer 1 includes a phase locked loop circuit. These synthesizers can be used in a variety of applications, for example, transceiver systems or isolated receivers that can include or use Bluetooth demodulators.

[0037] The reference signal f ret (To adjust the phase-locked loop circuit to this reference signal) feed it to the phase and / or frequency detector (PFD) 2. This signal is usually a signal with high frequency stability. The output of the phase / frequency detector 2 is fed via a filter 3 (typically a low-pass filter (LPF)) to generate the output signal f out 的Voltage Controlled Oscillator (VCO)4. Then the signal f out It is fed back to the frequency divider (DIV) 5, and then the divided signal generated by the frequency divider 5 is applied to the other input of the phase and / or frequency detecto...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method of generating a quantized signal in a Sigma-Delta modulator (25) comprises the steps of feeding a modulator input signal to a quantizer (15) via at least one integrator (12, 13); generating in the quantizer (15) a quantized signal; feeding back the quantized signal to be subtracted from the modulator input signal; and generating a dither signal to be applied to a point in the Sigma-Delta modulator. The dither signal is applied to a selected one of a number of different points (11, 14) in the Sigma-Delta modulator (25) in dependence of a control signal. In this way a method of generating a quantized signal in a Sigma-Delta modulator is provided which provides optimal results for different modes of the application, such as phase modulation mode and frequency modulation mode in a Bluetooth receiver.

Description

Technical field [0001] The present invention relates to a method of generating a quantized signal in a sigma-delta modulator arranged to work with a fractional divider in a frequency synthesizer used in a modulated signal receiver, the method comprising Steps: feeding the modulator input signal to the quantizer via at least one integrator; generating a quantized signal in the quantizer; feeding back the quantized signal so as to subtract the quantized signal from the modulator input signal; and generating The jitter signal to be applied to one point in the cumulative delta modulator. The invention also relates to a device including an accumulative delta modulator. Background technique [0002] Cumulative delta modulators or converters are used in several different applications, such as phase-locked loops and frequency synthesizers. In a synthesizer controlled by cumulative increments, the average divisor factor constitutes an integer part and a fractional part. The fractional par...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H03M3/02H03L7/197
CPCH03M7/3026H03M7/3033H03M7/3008
Inventor J·W·埃肯布罗克
Owner TELEFON AB LM ERICSSON (PUBL)