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IVC102P Datasheet(PDF) 6 Page - Burr-Brown (TI)

[Old version datasheet] Texas Instruments acquired Burr-Brown Corporation.
Part # IVC102P
Description  PRECISION SWITCHED INTEGRATOR TRANSIMPEDANCE AMPLIFIER
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Manufacturer  BURR-BROWN [Burr-Brown (TI)]
Direct Link  http://www.burr-brown.com
Logo BURR-BROWN - Burr-Brown (TI)

IVC102P Datasheet(HTML) 6 Page - Burr-Brown (TI)

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6
®
IVC102
C
INT
for constant I
IN, at the end of TINT
V
O = –IIN
T
INT
C
INT
V
O
I
IN
I
IN(t)
V
O =
–1
dt
C
INT
In addition, the offset voltage of the internal op amp and
charge injection of S2 contribute to the voltage on CINT at the
start of integration.
Performance of this basic approach can be improved by
sampling VO after the reset period at T1 and subtracting this
measurement from the final sample at T
2. Op amp offset
voltage, charge injection effects and I•RS2 offset voltage on
S2 are removed with this two-point measurement. The effec-
tive integration period is the time between the two measure-
ments, T
2-T1.
COMPARISON TO CONVENTIONAL TRANSIMPEDANCE AMPLIFIERS
With the conventional transimpedance amplifier circuit
of Figure 2a, input current flows through the feedback
resistor, RF, to create a proportional output voltage.
VO = –IIN RF
The transimpedance gain is determined by R
F. Very large
values of R
F are required to measure very small signal
current. Feedback resistor values exceeding 100M
Ω are
common.
The IVC102 (Figure 2b) provides a similar function,
converting an input current to an output voltage. The
input current flows through the feedback capacitor, CINT,
charging it at a rate that is proportional to the input
current. With a constant input current, the IVC102’s
output voltage is
VO = –IIN TINT/CINT
after an integration time of TINT.
VO is proportional to the integration time, TINT, and
inversely proportional to the feedback capacitor, CINT.
The effective transimpedance gain is TINT /CINT. Ex-
tremely high gain that would be impractical to achieve
with a conventional transimpedance amplifier can be
achieved with small integration capacitor values and/or
long integration times. For example the IVC102 with
CINT = 100pF and TINT = 100ms provides an effective
transimpedance of 1G
Ω. A 10nA input current would
produce a 10V output after 100ms integration.
The integrating behavior of the IVC102 reduces noise by
averaging the input noise of the sensor, amplifier, and
external sources.
Conventional Transimpedance Amplifier
Figure 2a
Integrating Transimpedance Amplifier
Figure 2b
R
F
V
O = –IIN RF
V
O
I
IN
CURRENT-OUTPUT SENSORS
Figure 3 shows a model for many current-output sensors
such as photodiodes and ionization chambers. Sensor output
is a signal-dependent current with a very high source resis-
tance. The output is generally loaded into a low impedance
FIGURE 2. Comparison to a Conventional Transimpedance Amplifier.
so that the terminal voltage is kept very low. Typical sensor
capacitance values range from 10pF to over 100pF. This
capacitance plays a key role in operation of the switched-
input measurement technique (see next section).
Provides time-continuous output
voltage proportional to IIN.
Output voltage after integration period is
proportional to average IIN throughout
the period.


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