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Author

Khlat Nadim

Bio: Khlat Nadim is an academic researcher. The author has contributed to research in topics: Signal & Electrical impedance. The author has an hindex of 1, co-authored 1 publications receiving 4 citations.

Papers
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Patent
13 Aug 2020
TL;DR: In this article, an adaptive frequency equalizer for wide modulation bandwidth envelope tracking (ET) was proposed, which works to adaptively correct for such voltage errors to provide improved overall power signal tracking at the PA, especially where there is a large trace inductance from the ETIC being located several centimeters (cm) away from the PA.
Abstract: An adaptive frequency equalizer for wide modulation bandwidth envelope tracking (ET) is provided. In this regard, an ET integrated circuit (ETIC) provides an ET power signal for one or more power amplifiers (PAs). A voltage error can occur in the ET power signal due to variable impedance sources, such as a variable load impedance at the PA and a variable trace inductance between the ETIC and the PA. The adaptive frequency equalizer disclosed herein works to adaptively correct for such voltage errors to provide improved overall power signal tracking at the PA, especially where there is a large trace inductance from the ETIC being located several centimeters (cm) away from the PA. Thus, embodiments of the adaptive frequency equalizer enhance ET performance for radio frequency (RF) systems having a modulation bandwidth of 100 megahertz (MHz) or above.

4 citations


Cited by
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Patent
23 Oct 2019
TL;DR: In this article, an envelope tracking (ET) integrated circuit (IC) is provided, which is configured to generate an ET voltage based on a supply voltage and provide the ET voltage to an amplifier circuit for amplifying a radio frequency (RF) signal(s).
Abstract: An envelope tracking (ET) integrated circuit (IC) (ETIC) is provided. The ETIC is configured to generate an ET voltage based on a supply voltage(s) and provide the ET voltage to an amplifier circuit(s) for amplifying a radio frequency (RF) signal(s). Notably, the RF signal(s) may be modulated in different modulation bandwidths and the amplifier circuit(s) may correspond to different load-line impedances. Accordingly, the ETIC may need to adapt the ET voltage such that the ETIC and the amplifier circuit(s) can operate at higher efficiencies. In examples discussed herein, the ETIC is configured to determine a time-variant peak of the ET voltage and adjust the supply voltage(s) accordingly. As a result, it may be possible to improve operating efficiency of the ETIC in face of a wide range of bandwidth and/or load-line requirements.

5 citations

Patent
20 May 2019
TL;DR: In this paper, a group delay optimization circuit is proposed to minimize the group delay offset by reducing the statistical indicator to below a defined threshold in one or more group delay optimisation cycles.
Abstract: A group delay optimization circuit is provided. The group delay optimization circuit receives a first signal (e.g., a voltage signal) and a second signal (e.g., a current signal). Notably, the first signal and the second signal may experience different group delays that can cause the first signal and the second signal to misalign at an amplifier circuit configured to amplify a radio frequency (RF) signal. The group delay optimization circuit is configured to determine a statistical indicator indicative of a group delay offset between the first signal and the second signal. Accordingly, the group delay optimization circuit may minimize the group delay offset by reducing the statistical indicator to below a defined threshold in one or more group delay optimization cycles. As a result, it may be possible to pre-compensate for the group delay offset in the RF signal, thus helping to improve efficiency and linearity of the amplifier circuit.

5 citations

Patent
10 Jun 2019
TL;DR: In this article, a dual-input envelope tracking (ET) integrated circuit (ETIC) and related apparatus are provided, which includes an ET voltage circuit configured to generate ET voltage and a first set of parameters.
Abstract: A dual-input envelope tracking (ET) integrated circuit (ETIC) and related apparatus are provided. The dual-input ETIC includes an ET voltage circuit configured to generate an ET voltage based on an ET voltage and a first set of parameters. The ET voltage may be provided to a power amplifier circuit(s) for amplifying a radio frequency (RF) signal(s) in an ET power range. The dual-input ETIC also includes a target voltage processing circuit configured to generate the ET target voltage based on a second set of parameters. The dual-input ETIC further includes a control circuit configured to determine the first set of parameters and the second set parameters based at least on the ET power range of the power amplifier circuit(s). As such, it may be possible to optimize the dual-input ETIC performance in a wide-range of modulation bandwidth, thus helping to improve linearity and efficiency of the power amplifier circuit(s).

4 citations

Patent
22 Oct 2020
TL;DR: In this article, a multi-bandwidth envelope tracking (ET) integrated circuit (IC) and related apparatus are provided, in which the ET voltages are generated based on the modulation bandwidth of the RF signal.
Abstract: A multi-bandwidth envelope tracking (ET) integrated circuit (IC) (ETIC) and related apparatus are provided. In a non-limiting example, the multi-bandwidth ETIC is coupled to an amplifier circuit(s) configured to amplify a radio frequency (RF) signal corresponding to a wide range of modulation bandwidth (e.g., from less than 90 KHz to over 40 MHz). In this regard, the multi-bandwidth ETIC is configured to generate different ET voltages based on the modulation bandwidth of the RF signal. By generating the ET voltages based on the modulation bandwidth of the RF signal, it may be possible to optimize operating efficiency of the amplifier circuit(s). As a result, it may be possible to improve power consumption and reduce heat dissipation in an apparatus employing the multi-bandwidth ETIC, thus making it possible to provide the multi-bandwidth ETIC in a wearable device.