Pass-Band Gain Improvement Technique for Passive RC Polyphase Filter in Bluetooth Low-IF Receiver Using Two RC Band-Stop Filters

Minh Tri Tran; Nene Kushita; Anna Kuwana; Haruo Kobayashi

doi:10.4028/www.scientific.net/AEF.38.192

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HomeAdvanced Engineering ForumAdvanced Engineering Forum Vol. 38Pass-Band Gain Improvement Technique for Passive...

Pass-Band Gain Improvement Technique for Passive RC Polyphase Filter in Bluetooth Low-IF Receiver Using Two RC Band-Stop Filters

Abstract:

This paper proposes a method to design a flat pass-band gain with two RC band-stop filters for a 4-stage passive RC polyphase filter in a Bluetooth receiver. Based on the superposition principle, the transfer function of the poplyphase filter is derived. However, the pass-band gain of this filter is not flat on the positive frequency domain. There are two local maximum values when the input signals are the wanted signals. Therefore, two RC band-stop filters are used to improve the pass-band gain of these local maximum values. As a result, a flat pass-band gain passive RC poly-phase filter is designed for a Bluetooth low-IF receiver which image rejection ratio is-36dB, and ripple gain is 0.47dB.

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Periodical:

Advanced Engineering Forum (Volume 38)

Pages:

192-205

DOI:

https://doi.org/10.4028/www.scientific.net/AEF.38.192

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Online since:

November 2020

Authors:

Minh Tri Tran, Nene Kushita, Anna Kuwana, Haruo Kobayashi*

Keywords:

Flat Pass-Band Gain, Low-IF Receiver, RC Polyphase Filter, Superposition Principle

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