EEEN30043 Sensors & Instrumentation

Datasheet Study Assignment 2014

Ganegama Perera

8091067

INA114BPManufacturer name: Texas InstrumentsProduct code: INA114BPURL: http://www.ti.com/lit/ds/symlink/ina114.pdfBipolar

Voltage gain range 1 – 10000

Expression for voltage gain: 1+50000Rs

-3dB Bandwidth

Gain Bandwidth(Hz)1.000E+00 1M1.000E+01 100k1.000E+02 10k1.000E+03 1k

Input Impedance: 1010 ΩInput bias current: ± 0.5 nA

Common mode input range: ± 13.5VCommon mode rejection:

Gain CMR1.000E+00 9.600E+011.000E+01 1.150E+021.000E+02 1.200E+021.000E+03 1.200E+02

Rs = 0 and gain =100Frequency

(Hz)Input noise voltage density (V/Hz^0.5) Input noise current density (A/Hz^0.5)

1.000E+01 1.500E+01 4.000E-01

1.000E+02 1.100E+01 3.000E-01

1.000E+03 1.100E+01 2.000E-01

1.000E+04 1.100E+01 1.000E-01

1.000E+05 1.100E+01 5.000E-02

1.000E+06 1.100E+01 2.500E-02

f = 10kHzResistance (Ω) Total voltage noise density (V/Hz^0.5) Noise Figure (dB)

1.000E+02 1.100E-08 1.872E-11

1.000E+03 1.100E-08 9.218E-12

1.000E+04 1.101E-08 2.397E-12

1.000E+05 1.208E-08 3.691E-13

1.000E+06 5.120E-08 6.418E-13

1.000E+07 5.001E-07 4.014E-12

1E+02 1E+03 1E+04 1E+05 1E+06 1E+07

1E-08

1E-07

1E-06

Resistance (Ω)

Tota

l vol

tage

noi

se d

ensit

y (V

/Hz^

0.5)

1.000E+02 1.000E+03 1.000E+04 1.000E+05 1.000E+06 1.000E+071.000E-13

1.000E-12

1.000E-11

1.000E-10

Resistance (Ω)

Noise

Fig

ure

(dB)

Keeping f = 10 kHz constant

The voltage density appears to increase exponentially after 1 MΩ due to the large Rs; total voltage noise density is dominated by Rs and the current noise.

The noise figure decreases with Rs until 100 kΩ after which the voltage noise density’s sudden increase starts to dominate the NF.

Rs = 100kfrequency(Hz) Total voltage noise density (V/Hz^0.5) Noise Figure (dB)

1.000E+01 4.272E-08 3.241E+00

1.000E+02 3.195E-08 2.096E+00

1.000E+03 2.282E-08 1.194E+00

1.000E+04 1.487E-08 5.472E-01

1.000E+05 1.208E-08 3.691E-01

1.000E+06 1.128E-08 3.235E-01

Keeping Rs = 100 kΩ constant

As frequency increases total voltage noise density and Noise figure decreases. Tis is due to the constant input noise voltage density while only input noise current density is the only change.

AD524Manufacturer name: Analog DevicesProduct code: IAD524AURL: http://www.analog.com/static/imported-files/data_sheets/AD524.pdf Bipolar

Voltage gain range 1 – 1000 (pin programmable: 1/10/100/1000)

Expression for voltage gain: 40000Rg

+1

-3dB Bandwidth

Gain Bandwidth(Hz)1.000E+00 1M1.000E+01 400k1.000E+02 150k1.000E+03 25k

Input Impedance: 109 ΩInput bias current: ± 50 nA

Common mode input range: ± 10VCommon mode rejection

GainCMR

1.000E+00 8.000E+011.000E+01 1.000E+021.000E+02 1.200E+021.000E+03 1.250E+02

Rs = 0 and gain =100

Frequency (Hz)

Input noise voltage density (V/Hz^0.5) Input noise current density (A/Hz^0.5)

1.000E+01 5.500E-09 8.000E-13

1.000E+02 5.500E-09 3.750E-13

1.000E+03 5.500E-09 3.750E-13

1.000E+04 5.500E-09 3.750E-13

1.000E+05 5.500E-09 3.750E-13

1.000E+06 5.500E-09 3.750E-13

f = 10kHzResistance (Ω) Total voltage noise density (V/Hz^0.5) Noise Figure (dB)

1.000E+02 5.500E-09 1.287E+01

1.000E+03 5.513E-09 4.543E+00

1.000E+04 6.657E-09 1.035E+00

1.000E+05 3.790E-08 2.725E+00

1.000E+06 3.750E-07 9.800E+00

1.000E+07 3.750E-06 1.937E+01

1.000E+02 1.000E+03 1.000E+04 1.000E+05 1.000E+06 1.000E+071.000E-09

1.000E-08

1.000E-07

1.000E-06

1.000E-05

Resistance (Ω)

Tota

l vol

tage

noi

se d

ensit

y (V

/Hz^

0.5)

1.000E+02 1.000E+03 1.000E+04 1.000E+05 1.000E+06 1.000E+071.000E+00

1.000E+01

1.000E+02

Resistance (Ω)

Noise

Fig

ure

(dB)

Keeping f = 10 kHz constant

The general trend is the increase in resistance results in an increase of total voltage noise density. The total voltage noise density increases exponentially after 100 kΩ caused by the current noise density starting to dominate.

From Rs = 100 Ω to 10 kΩ Rs dominates the Noise figure so NF is reducing with increases in Rs but when Rs is greater than 10 kΩ total voltage noise density starts to dominate (due to its exponential increase)

Rs = 100kfrequency(Hz) Total voltage noise density (V/Hz^0.5) Noise Figure (dB)

1.000E+01 8.019E-08 6.908E+00

1.000E+02 3.790E-08 2.725E+00

1.000E+03 3.790E-08 2.725E+00

1.000E+04 3.790E-08 2.725E+00

1.000E+05 3.790E-08 2.725E+00

1.000E+06 3.790E-08 2.725E+00

Keeping Rs = 100 kΩ constant

Noise figure and total voltage noise density decreases from 10 Hz to 100 Hz but for frequencies higher than 100 Hz both NF and total voltage noise density stay constant due to input voltage and current noise density stays constant.

INA111Manufacturer name: Texas InstrumentsProduct code: INA111BPURL: http://www.ti.com/lit/ds/symlink/ina111.pdf FET

Voltage gain range 1 – 10000

Expression for voltage gain: 1+50000Rg

-3dB Bandwidth

Gain Bandwidth(Hz)1.000E+00 2M1.000E+01 2M1.000E+02 450K1.000E+03 50

Input Impedance: 1012ΩInput bias current: ± 2 pA

Common mode input range: ± 12VCommon mode rejection

Gain CMR1.000E+00 9.000E+011.000E+01 1.100E+021.000E+02 1.150E+021.000E+03 1.150E+02

Rs = 0 and gain =100Frequency

(Hz)Input noise voltage density (V/Hz^0.5) Input noise current density (A/Hz^0.5)

1.000E+01 2.500E-08 8.000E-16

1.000E+02 1.200E-08 8.000E-16

1.000E+03 1.000E-08 8.000E-16

1.000E+04 1.000E-08 8.000E-16

1.000E+05 1.000E-08 8.000E-16

1.000E+06 1.000E-08 8.000E-16

f = 10kHzResistance (Ω) Total voltage noise density (V/Hz^0.5) Noise Figure (dB)

1.000E+02 1.000E-08 1.791E+01

1.000E+03 1.000E-08 8.498E+00

1.000E+04 1.000E-08 2.062E+00

1.000E+05 1.000E-08 2.562E-01

1.000E+06 1.003E-08 2.647E-02

1.000E+07 1.281E-08 4.326E-03

1.000E+02 1.000E+03 1.000E+04 1.000E+05 1.000E+06 1.000E+071.000E-08

1.000E-07

1.000E-06

Resistance (Ω)

Tota

l vol

tage

noi

se d

ensit

y (V

/Hz^

0.5)

1.000E+02 1.000E+03 1.000E+04 1.000E+05 1.000E+06 1.000E+071.000E-03

1.000E-02

1.000E-01

1.000E+00

1.000E+01

1.000E+02

Resistance (Ω)

Noise

Fig

ure

(dB)

Keeping f = 10 kHz constant

The total voltage noise density is constant at 10nV/Hz0.5 and at 10 MΩ the total voltage noise density increases slightly to 12.8nV/Hz0.5 this increase is relatively small compared to the previous sensors and can be attributed to the low input current noise density which causes the increase in resistance to cause a lower effect on the total voltage noise density.

The Noise Figure decreases constantly because input voltage and current noise density do not change and the change in Rs causes the change in NF.

Rs = 100kfrequency(Hz) Total voltage noise density (V/Hz^0.5) Noise Figure (dB)

1.000E+01 2.500E-08 1.398E+00

1.000E+02 1.300E-08 4.245E-01

1.000E+03 1.000E-08 2.562E-01

1.000E+04 1.000E-08 2.562E-01

1.000E+05 1.000E-08 2.562E-01

1.000E+06 1.000E-08 2.562E-01

Keeping Rs = 100 kΩ constant

As the frequency increases the total voltage noise density and the Noise Figure decrease consistently with decreases in input voltage noise density as input current noise density stays constant. At frequencies higher than 10 kHz the input voltage noise density stays constant so both total voltage noise density and NF stays constant.

LT1168Manufacturer name: Linear TechnologyProduct code: LT1168ACURL: http://cds.linear.com/docs/en/datasheet/1168fa.pdf Bipolar

Voltage gain range 1 – 10000

Expression for voltage gain: 1+49400Rg

-3dB Bandwidth

Gain Bandwidth(Hz)1.000E+00 400k1.000E+01 200k1.000E+02 13k1.000E+03 1k

Input Impedance: 1.25x1012ΩInput bias current: ± 40 pA

Common mode input range for Vs = ± 5V: -2.9V min 3.7VmaxCommon mode rejection

GainCMR

1.000E+00 9.500E+011.000E+01 1.150E+021.000E+02 1.350E+021.000E+03 1.400E+02

Rs = 0 and gain =100Frequency

(Hz)Input noise voltage density (V/Hz^0.5) Input noise current density (A/Hz^0.5)

1.000E+01 1.000E-08 7.400E-14

1.000E+02 1.000E-08 3.800E-14

1.000E+03 1.000E-08 2.000E-14

1.000E+04 1.000E-08 2.000E-14

1.000E+05 Bandwidth limit reached Bandwidth limit reached

1.000E+06 Bandwidth limit reached Bandwidth limit reached

f = 10kHzResistance (Ω) Total voltage noise density (V/Hz^0.5) Noise Figure (dB)

1.000E+02 1.000E-08 1.791E+01

1.000E+03 1.000E-08 8.498E+00

1.000E+04 1.003E-08 2.071E+00

1.000E+05 1.244E-08 3.903E-01

1.000E+06 7.467E-08 1.267E+00

1.000E+07 7.401E-07 6.363E+00

1.000E+02 1.000E+03 1.000E+04 1.000E+05 1.000E+06 1.000E+071.000E-08

1.000E-07

1.000E-06

Resistance (Ω)

Tota

l vol

tage

noi

se d

ensit

y (V

/Hz^

0.5)

1.000E+02 1.000E+03 1.000E+04 1.000E+05 1.000E+06 1.000E+071.000E-01

1.000E+00

1.000E+01

1.000E+02

Resistance (Ω)

Noise

Fig

ure

(dB)

Keeping f = 10 kHz constant

For Rs from 100 Ω to 10 KΩ input voltage noise density dominates over input current noise density so changes in Rs do not change the total voltage noise density; the constant total voltage noise density and increasing Rs causes Noise Figure to decrease.

For Rs greater than 10 kΩ the resistance is high enough that the input current noise density starts to dominate so total voltage noise density increases causing NF to start increasing because total voltage noise density increases more rapidly than Rs

Rs = 100kfrequency(Hz) Total voltage noise density (V/Hz^0.5) Noise Figure (dB)

1.000E+01 1.244E-08 3.903E-01

1.000E+02 1.070E-08 2.920E-01

1.000E+03 1.020E-08 2.661E-01

1.000E+04 1.020E-08 2.661E-01

1.000E+05 1.020E-08 2.661E-01

1.000E+06 1.020E-08 2.661E-01

Keeping Rs = 100 kΩ constant

From f = 10Hz to 100 Hz there is a significant change in input current noise density so total voltage noise density decreases slightly. For frequency greater than 100Hz the NF and total voltage noise density stay constant due to the constant input voltage and current noise density.