Feedback Loop Canceller Circuit
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1 Feedback Loop Canceller Circuit Bachelor Thesis Ahmad Bader Ibrahim Obeidat Supervised by Prof. Dr.-Ing. Klaus Solbach
2 Outline: 1 Motivation 2 Circuit description 3 Tasks and objectives 4 Active and passive Components 5 PCB Design 6 PCB Assembly 7 Testing and Measurements 8 Conclusions
3 1. Motivation: Designing a PCB to monitor the heart activity. The PCB with help of an antenna fixed near to human chest will; Monitor the heart activity Suppressing the undesired signal s components. antenna heart activity PCB
4 2. Circuit description: 2.1 circuit components : Directional couplers Power splitter IQ Modulator/Demodulator TL071CP Gali5+ Amplifiers SMD components (Resistors, Capacitors and Inductors)
5 2. Circuit description: 2.1 Circuit components arrangement Phase shift LO I/Q Mod a1 a3 I LPF LPF Q I B B Q a2 A I/Q Demod
6 2. Circuit description: 2.2 Circuit signals monitoring: Phase shift 868 MHz 17dBm Incident signal LO a1 I/Q Mod I Q a3 Reflected signal LPF LPF B B I Q a2 A I/Q Demod
7 2. Circuit description: 2.2 Circuit signals monitoring: signal s components First demodulated signals I/Q (mv) undesired signal s components Frequency (Hz) f resp. f heart
8 2. Circuit description: 2.2 Circuit signals monitoring: low pass filter output LO I/Q Mod a1 a3 I LPF B I Q LPF B Q a2 A I/Q Demod
9 2. Circuit description: 2.2 Circuit signals monitoring: low pass filter output I /Q (mv) filtered signals Frequency (Hz) f resp. f heart
10 2. Circuit description: 2.2 Circuit signals monitoring: closed loop Phase shift Incident signal LO a1 I/Q Mod I Q a3 Reflected signal LPF I B LPF B Q a2 A I/Q Demod
11 2. Circuit description: 2.2 Circuit signals monitoring: closed loop I/Q (mv) expected transfer function of the feedback loop Frequency (Hz) f resp. f heart
12 3. Tasks 1. Designing : schematic and layout 2. Circuit assembly 3. Testing and measurements
13 4. Passive and Active Components 4.1 Passive components 1. SMD components: Advantages Smaller components Fewer holes to be drilled. Flexible soldering Good performance at high-frequency
14 4.1 Passive components 2. MiniCircuit components Directional Coupler : FREQ (MHz) COUPLING (db) MAINLINE LOSS (db) DIRECTIVITY (db) ±0.5 Max IQ-Demodulator : FREQ (MHz) IQ-Modulator : FREQ (MHz) CONVERSION LOSS (db) CONVERSION LOSS (db) AMPLITUDE UNBALANCE (db) CARRIER REJECTION (-dbc) HARMONIC SUPPRESSION (-dbc) HARMONIC SUPPRESSION (-dbc)
15 4.1 Passive components 3. IQ-Modulator and IQ-Demodulator: Advantages Low conversion loss, 6.4dB typ. Excellent 3rd and 5th order harmonic suppression Good amplitude & phase unbalance (demod.) Good carrier and sideband rejections (mod.) IQ-Modulator IQ-Demodulator
16 4. Passive and Active Components 4.2 Active components component Producer Power supply Main purpose Gali5+ MiniCircuit +7 V Signal s Power Amplification TL071CP Texas ins. +/- 7 V Building the LPF and the I/Q Amplification
17 5. PCB Design Board schematic
18 6. PCB Assembly 6.1 Top view
19 6. PCB Assembly 6.2 Bottom view
20 7. Testing and Measurements 7.1 Operational Amplifier (saturation) (potentiometer used to adjust amp. and offset values ) Measurement Power supply Procedure Result OP-Amp Saturation +/-7 Volt Varying input voltage and measure the output voltage Saturation at +100mV and -125mV
21 7. Testing and Measurements 7.2 Second-Order Low-Pass Filter Sallen-Key Topology =0.3 Hz R1 = R2 = R and C1 = C2 = C.
22 7. Testing and Measurements 7.2 Second-Order Low-Pass Filter (transfer function) Measurement Power supply Procedure Result transfer function +/-7 Volt Using function generator to deliever = 500 varying the frequency cutoff frequency is optimal transfer function of the low pass filter
23 7. Testing and Measurements 7.3 IQ Modulator function test Equipment used : Results: Signal s power is low Solution : RF Signal Generator, directional coupler, Power Divider and Spectrum Analyzer. attenuator removed LC filters added Copper tape used Attenuator 3dB
24 7. Testing and Measurements 7.3 S-Parameter Device used R&S ZVL network analyzer Calibration Kit 85052D Frequency = 868 MHz Power = -2,5 dbm = 2.5 NWA
25 7. Testing and Measurements 7.4 S-Parameter Amplification Phase set up =
26 7. Testing and Measurements 7.5 Transfer function measurement of the feedback loop Function generator : 200m, Frequency : 100mHz-10 Hz Frequency generator : 868 MHz LO-Signal with -11dBm Digital oscilloscope External IQ-Modulator
27 7. Testing and Measurements 7.5 Transfer function of the feedback loop I-Signal measurement Q-Signal measurement
28 8. Conclusions PCB of the feedback canceller was designed, tested and can be improved. Every sub-circuit was tested and optimized.
29
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