Mirrocle Bias-Differential Quad-Channel (BDQ) Amplifier... User manual

Mirrorcle Technologies, Inc.
Bias-Differential Quad-Channel (BDQ) Amplifier 4.x
Dr.VeljkoMilanović
AbhishekKasturi
MirrorcleTechnologies,Inc.
February2013
© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.

© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Overview
Bias Differential Quad-channel (BDQ) Amplifier is a high voltage
amplifier with two analog inputs and four high voltage analog
outputs. It is designed and optimized for the driving of Mirrorcle
Technologies MEMS mirrors at voltages up to 140V, whether from
a National Instruments DAQ card or directly from BNC inputs. The
amplifier does not require an external high voltage supply, and
runs from a single 5V DC supply. The input voltage range of the
amplifier is -10V to +10V. The BDQ Amplifier has a bandwidth
of up to 60 kHz, driving a 100pF capacitive load.
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© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Features
Two BNC analog inputs: -10V to +10V
NI-DAQ card compatible, 68-pin connector input
Low power, powered by NI-DAQ card when used or from a
low power 5VDC adapter
Four high voltage output channels, 0V-150V
Outputs differential pairs of 7.5X amplified input voltages
biased at 70V (adjustable internally)
Embedded regulated DC/DC converter creates 156V
supply (Vcc) from the 5VDC input (VDD)
Bandwidth up to 60kHz
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© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
External Inputs: Using a
3.5mm TRS to Dual
RCAF breakout, and a
RCA to BNC adaptors
for input signals
Amplifier Inputs
Power supply 5VDC
68-Pin NIDAQ Input from
compatible National
Instruments DAQ Cards
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© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Specifications – DAQ Input
68-pin SCSI connector compatible with many NI-DAQ cards (e.g. PCI-6221)
Cable is not provided
Input voltage range: -10V to 10V on AO0 (X) and AO1 (Y)
Input impedance ~ 16 k
X input: DAQ AO0, Y input: DAQ AO1, HV Enable: DAQ P1.0
For DAQ input option, power is provided from the NIDAQ card,
and external +5VDC adapter should NOT be plugged in.
The stereo jack and BNC connectors must not be plugged in as
they bypass the DAQ input voltages.
HV Enable switch for the high voltage supply on the front panel
may be used, but software control via NIDAQ is recommended
in this input mode.
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© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Specifications – External Input
Input voltages -10V to 10V on X and Y bi-polar channels
Input voltage range: -10V to 10V on AO0 (X) and AO1 (Y)
Input impedance ~ 16 k
X input: red BNC, Y input: white BNC
For External input option, external +5VDC adapter should be
plugged in.
The stereo jack to 2x BNC connector should be plugged in to
bypass the DAQ inputs and allow external inputs.
The HV Enable switch on the front panel should be ON to
enable high voltage.
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© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Bi-Directional Driving with Unipolar Voltages
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HV_B is high
HV_A is low
Mirror rotates in
X- direction
HV_A is high
HV_B is low
Mirror rotates in
X+ direction
Analog Input X

© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Specifications - Output
X+ output voltage = Vbias + 7.5*X
X- output voltage = Vbias – 7.5*X
Y- output voltage = Vbias + 7.5*Y
Y+ output voltage = Vbias – 7.5*Y
Slew Rate: 10 V/µs
Bandwidth: ~60 kHz
Output Impedance: 1 k
Default bias setting of 70V limits appropriate Input voltages to –
Vbias/Gain to +Vbias/Gain = -9.33 to 9.33 volts
For this range of inputs, output will swing from 0 to 140V
For devices with lower operation voltages it is advised to lower the bias to e.g.
50V to reduce chances of device damage
Consult the individual device’s datasheet to verify the maximum voltage and
adjust the bias and inputs accordingly
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© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Output Connector Pinout and Functions
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Input:8‐ PinHeader
PinName Description
1HV_A(X+) HighVoltageOutputforChannelX+
2 GND Ground
3HV_B(X‐)HighVoltageOutputforChannelX‐
4 GND Ground
5HV_C(Y‐)HighVoltageOutputforChannelY‐
6 GND Ground
7HV_D(Y+) HighVoltageOutputforChannelY+
8 GND Ground
9NC NoConnection
10 NC NoConnection

SPECIFIC INSTRUCTIONS
BDQ PicoAmp4.x
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© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Bringing up BDQ Amplifier
1. Turn on the BDQ Amplifier by connecting the 5V supply.
2. Connect the BNC inputs to a source.
3. Prior to enabling high voltage, send mirror origin voltage of 0V to analog
inputs X and Y.
4. To enable the high voltage, set the High Voltage switch to the ON position.
The red LED will indicate when the high voltage is on.
WARNING: DO NOT ENABLE HIGH VOLTAGE IF THE X AND Y INPUTS ARE AT NOT SET AT
OR NEAR 0V. SUDDEN VOLTAGE DIFFERENCE ON OUTPUT PAIRS MAY DAMAGE MEMS
MIRROR.
5. Now all high voltage outputs X+, X-, Y-, Y+ should be biased at
70V. MEMS mirror may move slightly to a new, ‘biased origin.’ This is now
the new ZERO position for the MEMS mirror.
6. BDQ Amplifier is now ready to drive the MEMS mirror to new positions,
waveforms, etc. User should avoid discontinuous waveforms, steps, and
impulses, and filter the input signals before the amplifier.
WARNING: SEE NEXT PAGE FOR SAFE RANGE OF INPUT VOLTAGES WHEN USING MIRRORCLE
MEMS MIRRORS
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© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Shutting down BDQ Amplifier 4.x
1. Send mirror origin voltage of 0V to analog inputs X and Y.
2. Disable the high voltage by setting the High Voltage switch to the off
position.
WARNING: DO NOT UNPLUG OR DISABLE ANALOG INPUTS PRIOR TO THIS STEP TO
AVOID APPLYING 0V TO ACTIVE ANALOG INPUTS.
3. Remove power as needed, unplug cables or disable inputs, etc.
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© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Safe Range of Input Voltages
1. Each Mirrorcle MEMS Mirror datasheet specifies the maximum
voltage rating (Vmax) for a given device on page 1, e.g. 125V.
2. To obtain analog input voltage range:
1. Maximum Vin = (Vmax / 7.5) – 9.333
2. Minimum Vin = 9.333 – (Vmax / 7.5)
3. For example above, the highest acceptable input voltage for
this MEMS mirror will be Vin = 7.33V
4. The lowest acceptable input voltage for this MEMS mirror will
be Vin = -7.33V
Exceeding these limits may damage the MEMS mirror.
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© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Internal user-adjustable points
Power supply input
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bias-regulating pot
(currently set for 70V
output bias)

© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Adjusting bias voltage
Connect BNC inputs to amplifier
Apply 0V to both BNCs or leave them both unplugged
Ensure high voltage is ON by the Enable Override switch on front
panel
Monitor an output pin (e.g. X+) and turn bias-adjusting
potentiometer (next page,) until the output voltage (DC) is at the
desired level.
Double check that all channels, X+ X- Y- Y+, have the same bias.
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© 2012 - 2013 Mirrorcle Technologies, Inc. All rights reserved.
Modulation / Trigger Output
Modulation (M) output
Synchronous laser modulation, triggering, etc, can ONLY be used with the
DAQ input and if your NI-DAQ card has “correlated DIO” feature.
SMA connector is directly connected to DAQ card’s P0.0 DIO.
It can be used as a digital INPUT or digital OUTPUT
Mirrorcle Tech software utilizes this output to drive a modulate-able laser ON or OFF
in sync with mirror position.
E.g. NI-6221, NI-6229 have this feature.
E.g. NI-6062E does not have this feature.
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