Tama300 xix
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2. ??. ??Demodulator?Mixer??????????????. 3. 1. ??. . Photo detector. ???????????????????????????????????. . ???? (demodulator). . . . . . . . . . 15M. 2f : -12dBm 3f : -53dBm 4f : -46dBm 5f : -52dBm. 1f : -18dBm. . . . . ??????????????. . ?????????????????????????????. .

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’05.03.26(土)

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Tama300 xix

TAMA300XIX()

TAMA Collaboration


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

  • DemodulatorMixer


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

1.

Demodulator

Photo detector

(demodulator)

Power [dBm]

2f : -12dBm 3f : -53dBm 4f : -46dBm 5f : -52dBm

1f : -18dBm

0

Frequency [Hz]

15M


2 1 demodulator

2-1. Demodulator

Buffer

Phase shifter

LO

15MHz

Mixer

IF

RF

Demodulator

Photo detector

LOPhase shifter

RFTAMAMixer


2 2 mixer

2-2. Mixer

15M

(LO)(RF)(IF)

IF

LO

RF

LO

RF

IF

DC

30M

15M


2 2 mixer1

2-2. Mixer

LORF

LO

RF

IF

LORF

LORF

LORF

LORF


2 2 mixer2

2-2. Mixer

LORF

LORF

LO

RF

IF

LORF

LORF

LORF

LORF


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2-3.

RF

LO1f

TAMADemodulator

Buffer

LO

Phase shifter

power

Mixer

RF

LO15MHz

RF15MHz+1kHz

IF1kHzpower

15M+1kHz


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

2-3.

RF

LO1f

Buffer

LO

Phase shifter

1kHz

power

Mixer

RF

LO15MHz

RF15MHz+1kHz

IF1kHzpower

15M

+1kHz


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

2-3.

RF

LO1f

Buffer

LO

Phase shifter

1kHz

power

Mixer

RF

LO15MHz

RF30MHz+1kHz

IF1kHzpower

30M

+1kHz


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

2-3.

RF

LO1f

Buffer

LO

Phase shifter

1kHz

power

Mixer

RF

LO15MHz

RF45MHz+1kHz

IF1kHzpower

45M

+1kHz


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

2-3.

RF

LO1f

10dB

Buffer

LO

Phase shifter

1kHz

Mixer

3fHarmonic distortion10dB(3)

RF

45M+1kHz


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3-1.

LO

Phase shifter

over drive

Phase shifterattenuator


3 2 lo

3-2. LO

Buffer

LO

Phase shifter

Mixer

Amp 11dB

Buffer

LO

Phase shifter

AttN 10dB

Mixer

LO RFor+1kHz

LO

IF1kHz

Phase Shifter

-21dB

-18dB


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

3-3. Mixer

Mixer

Mixer

Mixer

Double balanced mixer

TUF-3LH

(minicircuits)

LO

Mixer


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

4-1.

Dark port

Power splitter

Photo detector

filter

1f : -18dBm 2f : -12dBm 3f : -53dBm 4f : -46dBm 5f : -52dBm


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

4-1.

LO

Dark port

Power splitter

Photo detector

filter

Demodu-lator

1f : -18dBm 2f : -12dBm 3f : -53dBm 4f : -46dBm 5f : -52dBm

LO


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4-1.

()2()2

1f2f

Dark port

Power splitter

Photo detector

buffer

down

1f : -18dBm 2f : -12dBm 3f : -53dBm 4f : -46dBm 5f : -52dBm

1f()

LO

buffer

2f


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

4-1.

()2()2

1f3f

Dark port

Power splitter

Photo detector

buffer

down

1f : -18dBm 2f : -12dBm 3f : -53dBm 4f : -46dBm 5f : -52dBm

1f()

down

2f()

buffer


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

4-2.

TAMA


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

4-2.

1f2f

Demodulatorfilter

upper limit

2

2f


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4-2.

1f2f

Demodulatorfilter

upper limit

3

3f


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

5.

LO

Phase shifter

over drive

Mixer

LO

PD


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

3-1. Demodulator LO

LO

Phase shifterharmonic distortion

Phase shifter

Phase shifterover drive

TAMA300LO11.8dBmPhase shifter0dBm

2f-10dB

Phase shifterattenuator


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

3-1. Demodulator LO

LO

Phase shifterharmonic distortion

Phase shifter

Phase shifterover drive

TAMA300LO11.8dBmPhase shifter0dBm

2f-20dB

10

Phase shifterattenuator


4 2 demodulator rf

4-2. Demodulator RF

RF

-27dB

-60dB

-54dB

-58dB

Mixer

RF

IF1kHz

Mixer

LO RFor+1kHz

Low-pass filter

Buffer

RF

2nd wave notch

Buffer


4 2 demodulator rf1

4-2. Demodulator RF

RF

Mixer

RF

Mixer

RF

Low-pass filter

Buffer

10-7

RF

2nd wave notch

Buffer


4 2 demodulator rf2

4-2. Demodulator RF

RF

Mixer

RF

Mixer

RFBuffer

Low-pass filter

Buffer

Buffer

RF

2nd wave notch

Buffer


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

3-4. Demodulator LO

Harmonic Distortion

Mixer

LO

Mixer

15MHz

Resistance

Mixer

RF

50

LORFLO

-37dB


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

3-4. Demodulator LO

Harmonic Distortion

Mixer

LO

Mixer

15MHz

Mixer

RF

50

LORFLO

-13dB

Mixer


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5-2.

1f

  • Q-phase

Demodulator noise

1f


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

5-2.

  • I-phase

1f

1f

Demodulator noise


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

5-2.

IQ

30Hz

30Hz

2f1003f6.3


3 3 demodulator

3-3. Demodulator

Influence of the harmonics

Demodulation also down convertunnecessary harmonics to AF

It is a noise of the signal.

AF

LO

RF

Removed by a filter

Calculation of the

Standard

Harmonics (it is not exist in ideal)

LO

RF

It is impossible to distinguish!

Signal of the interferometer

To do something against harmonics.


4 improvement of the demodulator

4. Improvement of the demodulator

Buffer

LO

Amp

Output

Phase shifter

Mixer

Diplexer1st order

RF

Improvement

Buffer

Amp

LO

Amp

Phase shifter

Output

AttN 20dB

Mixer

2nd wave notch

Low-pass filter

Diplexer2nd order

RF

Buffer

Buffer


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

Harmonic Distortion

Harmonic Distortion

NdB

LO-25dB

RF0dB

AF-25dB

(0.3%)

dBdBm

0dBm=1mW

3dB=210dB=1020dB=100

LO


Detector

Detector

Detector

DC

T

Detector

TAMA300Detector


Mixer

Mixer

-

-

+

-

+

off

+

on

  • Mixer

  • LORFdown convert

  • Mixer

    LO

LO

RF

diplexer (IF)

Output signal

Mixer

+

+

+

+

-

-

+

+

-

-

-

-

on

off

LO

+

+

-

+

-

-

LO


E2 80 9905 03 26 ef bc 88 e5 9c 9f ef bc 89

5-2.

2f1f


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