This document summarizes the results of device modeling and simulation of a 33 uH choke coil with a maximum current of 1.4 A. It describes the components, provides an overview of the auto balancing bridge method and equivalent circuit used for simulation, and shows the frequency response characteristics from 100 Hz to 100 MHz. Tables compare the measured and simulated impedance values and self-resonant frequency.

1. Device Modeling Report
COMPONENTS : CHOKE COIL
PART NUMBER : 8RHB
VALUE : 33 uH
CURRENT MAX : 1.4 A
MANUFACTURER : TOKO
Bee Technologies Inc.
All Rights Reserved Copyright (c) Bee Technologies Inc. 2004

2. Theory: Auto Balancing Bridge Method
Optimization of Simulation
Range of adjustment Frequency:100 to100M(Hz)
Frequency vs.|Z| and Frequency vs.θz Characteristic
Attention)
Please use SPICE MODEL within the range from 100 to 100M(Hz)
L1
C1
R1
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3. Equivalent circuit
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4. Frequency vs. |Z| Characteristic
Evaluation circuit
R3 V1 1
1k
0Vdc
U1
I1
1Aac 8RHB
0Adc
0
Simulation resuit
Simulation
All Rights Reserved Copyright (c) Bee Technologies Inc. 2004

5. Comparison Table
|Z|(ohm) : |Z|(ohm) :
Frequency (Hz) % Error
Measurement Simulation
100 75.6297 m 74.378 m 1.655
1K 224.11 m 213.758 m 4.619
10K 2.07584 2.0154 2.912
100K 20.3452 20.143 0.994
1M 195.326 203.051 -3.955
Measurement Simulation % Error
F SRF (Hz) 11.350 M 11.122 M 2.009
|Z| (ohm),
at F SRF 46.3849 k 47.582 k -2.581
All Rights Reserved Copyright (c) Bee Technologies Inc. 2004