Frequency modulator

A frequency modulation and modulation control technology, applied in modulation, angle modulation, modulated carrier system, etc., can solve the problems of design time and power consumption burden, high cost of digital circuit, difficult clock tree delay, etc., to reduce the design time and cost. Power consumption, effect of improving processing performance

Inactive Publication Date: 2013-12-04
MEDIATEK INC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, digital FM processing circuits typically require a deep clock tree (usually a tree structure of multiple inverters and buffers, the inverter and some of the buffers have clock gating capability), so how to balance the delay of this clock tree is particularly difficult, and it will also result in higher digital circuit cost penalty
In addition, the required synchronization between integer and fractional parts in the digital domain can unnecessarily burden design time and power consumption

Method used

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  • Frequency modulator
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Embodiment Construction

[0015] Certain terms are used in the specification and following claims to refer to particular elements. Those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This description and the subsequent claims do not use the difference in name as the way to distinguish components, but use the difference in function of the components as the criterion for distinguishing. "Includes" mentioned throughout the specification and subsequent claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" should be construed herein to include any direct and indirect means of electrical connection. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

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Abstract

A frequency modulator includes a digitally-controlled oscillator (DCO) arranged for producing a frequency deviation in response to a modulation tuning word and a phase-locked loop (PLL) tuning word. In addition, another frequency modulator includes a DCO and a DCO interface circuit. The DCO is arranged for producing a frequency deviation in response to an integer tuning word and a fractional tuning word. The DCO interface circuit is arranged for generating the integer tuning word and the fractional tuning word to the DCO, wherein the fractional tuning word is obtained through asynchronous sampling of a fixed-point tuning word.

Description

【Technical field】 [0001] The embodiment of the present invention is related to a frequency modulator using a digitally controlled oscillator (DCO), especially to a frequency modulator that includes a modulation control word for receiving and a phase-locked loop (PLL) control word and / or for receiving an asynchronous Sampling the frequency modulator of the DCO of the fractional control word and the integer control word. 【Background technique】 [0002] Transmitters based on all-digital phase-locked loops (ADPLL) are increasingly used to replace traditional analog-based in-phase / quadrature (I / Q) transmitters. In particular, the ADPLL can not only be used to provide a single-frequency sinusoidal RF carrier, but can also be tuned as a broadband tuner as part of, for example, a polar transmitter. The additional effect of using the wideband frequency modulation (FM) described above is also clear and can usually be achieved by using a digital two-point modulation scheme. The digit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099H03L7/18
CPCH04L27/12H04L27/127H03C3/0958
Inventor 罗伯·伯根·史塔斯魏奇王琦学
Owner MEDIATEK INC
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