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PAUL SCHERRER INSTITUT SLS RF Group
Phase Shifter
and
IQ Demodulator
M Gaspar, C.Gough, M Mailand
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PAUL SCHERRER INSTITUT SLS RF Group
Phase Shifter
•LCD / knob / keypad gives easy user interface•RS232 on rear panel•No moving mechanical parts so zero hysteresis•Absolute errors difficult to measure but probably <±2° RF•Resolution is unlimited - interesting for precision timing applications
(e.g. 0.1° RF step gives 0.55ps time step)
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PAUL SCHERRER INSTITUT SLS RF Group
Phase Shifter
•One microcontroller can control many channels•High precision dual DAC - errors are dominated by IQ Modulator•Power levels limited to around 0dBm•Software took over two months !
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PAUL SCHERRER INSTITUT SLS RF Group
IQ Demodulator
3GHz and 500MHzversions
I + Q outputs are read by computer
Computer finds modulus and argument from SQR(I2+Q2) and ARCTAN (Q/I)
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PAUL SCHERRER INSTITUT SLS RF Group
IQ Demodulator
Short cable runs in temperature controlled environment help maintain phase stability
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PAUL SCHERRER INSTITUT SLS RF Group
IQ Demodulator
Errors are more likely to be from the mechanical phase shifter than from the AD8347
Modulus and argument error plots
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PAUL SCHERRER INSTITUT SLS RF Group
IQ Demodulator
Profoundly
satisfied
colleague !