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Effecting Resonant Transfer

IP.com Disclosure Number: IPCOM000096461D
Original Publication Date: 1963-Jun-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Dahlman, P: AUTHOR [+2]

Abstract

Resonant transfer is a technique used to efficiently transfer amplitude sampled data in time-multiplexed transmission systems between low-pass filters. In advanced techniques, it is necessary to effect resonant energy transfer between a low-pass filter and a band-pass filter or between a band-pass filter and a low-pass filter or between two band-pass filters. The principles of resonant transfer between low-pass filters are applicable to these three situations.

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Effecting Resonant Transfer

Resonant transfer is a technique used to efficiently transfer amplitude sampled data in time-multiplexed transmission systems between low-pass filters. In advanced techniques, it is necessary to effect resonant energy transfer between a low-pass filter and a band-pass filter or between a band-pass filter and a low-pass filter or between two band-pass filters. The principles of resonant transfer between low-pass filters are applicable to these three situations.

Low-pass to band-pass resonant transfer is shown. The following analysis applies to the band-pass to band-pass and the band-pass to low-pass situations. Impedances Z1 and Z2 and inductance L1 represent a low-pass filter. The low- pass filter output is shunted with capacitor C1. The low-pass filter is in series with switch S through inductance L2. Impedances Z3 and Z4, in combination with inductor L4 and capacitor C3, comprise a band-pass filter. The input to this is shunted with a tank circuit comprised of capacitor C2 and inductor LS in parallel. The band-pass filter is connected in series with switch S through inductor L3.

Resonant transfer, a transfer of voltage from C1 to C2 with no attenuation, occurs provided several conditions are met: a. C1, C2, L2 and L3 form a series resonant circuit resonating at fo = 1/2t(t = time, S is closed) b. C1= C2= C3 c. L4 = L5 d. XL1 >> XL2 at fo e. Combined impedance of L4 and C3>> XL3 at fo f. XL4>> XC1 at fo g. Combined impedance of L4 and C3 >> impedance LS and C2 at fo h. Tank circuit C1 and LS resonates at fr, a frequency located in the pass-band. i. Series circuit L4 and C3 resonates at fr. j. fo >> fr k....