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Digital time interleaved rf‑pwm transmitter

An interleaver, digital modulator technology, applied in the field of RF pulse width modulation transmitters, can solve the problems of expensive, changing pulse duration, bulky, etc.

Active Publication Date: 2017-03-01
TEXAS INSTR INC
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  • Abstract
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AI Technical Summary

Problems solved by technology

Some problems with this arrangement are: (1) when the SDM is used as the pulse generator 110, the load typically includes bulky and expensive analog post-filtering, and (2) the pulses from one RF cycle to the next are severely limited change in duration

Method used

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  • Digital time interleaved rf‑pwm transmitter
  • Digital time interleaved rf‑pwm transmitter
  • Digital time interleaved rf‑pwm transmitter

Examples

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Embodiment Construction

[0028] Referring now to the drawings, in which, for the sake of clarity, depicted elements are not necessarily shown to scale, and in which like or similar elements are designated by like numerals throughout the several views.

[0029] turn to Figure 3-6 , shows an example of a digital transmitter 200-A according to the present invention. As shown, digital modulator 102 is capable of generating I and Q signals (similar to FIG. 2 above). SDMs 202-A1 and 202-A2 (which are typically low-pass multi-bit SDMs with M output levels) receive I and Q signals from digital modulator 102, respectively. These SDMs 202-A1 and 202-A2 are typically powered by a clock signal CLK1 (which may for example have a frequency F S ) to provide the clock to filter the I and Q signals to reduce the Figure 4 Shown) the number of bits of the I and Q signals. Pulse Width Modulators or PWMs 204-A1 and 204-A2 (which may be, for example, low-pass PWMs) receive filtered I and Q signals from SDMs 202-A1 an...

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Abstract

The present invention relates to digital time-interleaved RF-PWM transmitters. A method of transmitting a radio frequency (RF) signal is provided. In-phase (I) and quadrature (Q) signals are received and filtered using sigma‑delta modulation. I and Q pulse width modulated signals are generated from the filtered I and Q signals and interleaved to generate time interleaved signals. The time-interleaved signal is then amplified to generate an RF signal.

Description

technical field [0001] The present invention relates generally to radio frequency (RF) transmitters, and more particularly to RF pulse width modulation (PWM) transmitters. Background technique [0002] In many conventional applications such as Wireless Local Area Network (WLAN) or Long Term Evolution (LTE), the signal operates at low amplitude, which has a peak-to-average ratio and causes transmitter performance to suffer. This is partly due to the performance of conventional power amplifiers (PAs) at these peak-to-average ratios, where power efficiency decreases exponentially. This is illustrated in Figure 1, which compares the performance of a Class AB amplifier, a switching PA, and a Doherty PA. As shown, the Doterty PA has the best performance, but this type of PA is bulky (uses a high-power combiner not suitable for CMOS process), and is usually used in the base station. Switching PAs (which can use polar or linear amplification with nonlinear component (LINC) archite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/02H04L1/00
CPCH04B1/04H04L1/0071
Inventor R·何扎L·丁J·胡尔B·S·哈罗恩
Owner TEXAS INSTR INC
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