Differential Amplifiers

A differential amplifier is a type of electronic amplifier that increases the difference between two input voltages. Differential amplifiers also suppress voltage to be common to the two inputs. A digital amplifier is one of the most used and important components within integrated circuits (ICs).

Differential Amplifier inputs

  • One inverting
  • One non-inverting

Why use a Differential Amplifier?

Differential amplifiers are used to amplify balanced differential signals which are used to communicate small signals in electrically noisy environments. The signal wires should be close or wired together and most of the induced noise will be "common mode", affecting both wires in the same way.

Differential Amplifier Applications

The main application of a differential amplifier is to get rid of any noise and voltages that are present in both of the voltage inputs. This noise is present in common mode fluctuating voltage. Differential amplifiers are used in circuits that utilise negative feedback, such as controlling motors and signal amplification.

Various electronic devices use differential amplifiers

  • FM/Am Radio signal recovery
  • Audio pre-amplifiers
  • Microphone pre-amplifiers
  • TV Signal recovery
  • Digital to analogue converters

A Differential amplifier can also be configured to operate as a single-ended amplifier by grounding one of the inputs.

Modern differential amplifiers normally sit on a single microchip. Inside the microchip, positive and negative signals are added and become a single output.

What do CMRR and PSRR stand for?

  • CMRR is the abbreviated version of Common Mode Rejection Ratio and refers to the power ratio of differential gains between the common-mode gain. This unit is measured in positive decibels.
  • PSRR is the abbreviated version of Power Supply Rejection Ratio and refers to an amplifiers ability to consistently maintain output voltage white the DC voltage supplied is varied.

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Description Price Power Supply Type Typical Single Supply Voltage Typical Dual Supply Voltage Maximum Input Offset Voltage Maximum Input Resistance Maximum Voltage Gain Typical Gain Bandwidth Product Minimum CMRR Output Configuration Number of Channels per Chip Mounting Type Package Type Pin Count Rail to Rail
RS庫存編號 378-2777
製造零件編號INA145UA
TWD163.00
單位
Dual, Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 1mV 0.08MΩ 60dB - 76dB - 1 Surface Mount SOIC 8 -
RS庫存編號 806-7903
製造零件編號AD8216WYRZ
TWD170.00
/個 (每包:2個)
單位
Single 4.5 → 5.5 V - ±0.5 (Typical)mV 200 (Common Mode) kΩ, 400 (Differential) kΩ 3 (Typical)V/V 3MHz - - 1 Surface Mount SOIC 8 -
RS庫存編號 100-3829
製造零件編號INA145UA
TWD138.40
毎管:75 個
單位
Dual, Single 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 1mV 0.08MΩ 60dB - 76dB - 1 Surface Mount SOIC 8 -
RS庫存編號 709-7070
製造零件編號AD8216YRZ
TWD143.00
單位
Single 5 V - 0.5mV 0.4MΩ 9.54dB - 80dB - 1 Surface Mount SOIC 8 -
RS庫存編號 647-659
製造零件編號INA105KP
TWD371.00
單位
Dual - ±15V 0.5mV 0.05MΩ 0dB - 72dB - 1 Through Hole PDIP 8 -
RS庫存編號 100-0744
製造零件編號INA105KP
TWD319.50
毎管:50 個
單位
Dual - ±15V 0.5mV 0.05MΩ 0dB - 72dB - 1 Through Hole PDIP 8 -
RS庫存編號 806-7935
製造零件編號AD8274ARZ
TWD99.00
/個 (每包:2個)
單位
Dual - ±2.5 → ±18V 1100µV - - 20MHz 83dB - 1 Surface Mount SOIC 8 -
RS庫存編號 851-6859
製造零件編號LTC6362IMS8#PBF
TWD156.40
/個 (每包:5個)
單位
Single 2.8 → 5.25 V - ±30mV 230kΩ 95dB 180MHz 75dB - 1 Surface Mount MSOP 8 Rail to Rail Input/Output
RS庫存編號 100-3838
製造零件編號INA148UA
TWD166.00
毎管:75 個
單位
Dual, Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 5mV 2MΩ 0dB - 70dB - 1 Surface Mount SOIC 8 -
RS庫存編號 155-7739
製造零件編號LTC6409CUDB#TRMPBF
TWD215.30
個 (在毎卷:500)
單位
Single 2.7 → 5.25 V - ±1400µV 165 (Common Mode) kΩ, 860 (Differential Mode) Ω 65dB 10GHz - - 1 Surface Mount QFN 10 -
RS庫存編號 522-8455
製造零件編號AMP03GPZ
TWD345.00
單位
Dual - ±6 → ± 18V 0.75mV - - - 80dB - 1 Through Hole PDIP 8 -
RS庫存編號 121-8455
製造零件編號INA106KP
TWD382.20
毎管:50 個
單位
Dual - ±15V 0.5mV 0.11MΩ 20dB - 86dB - 1 Through Hole PDIP 8 -
RS庫存編號 661-2397
製造零件編號INA159AIDGKT
TWD160.00
單位
Single 3 V, 5 V - 0.5mV 0.24MΩ 13.98dB - 80dB - 1 Surface Mount MSOP 8 Rail to Rail Input
RS庫存編號 922-3221
製造零件編號INA159AIDGKT
TWD104.00
個 (在毎卷:250)
單位
- - - - - - - - - - - - - -
RS庫存編號 697-7252
製造零件編號AD8275ARMZ
TWD162.00
單位
Dual, Single 5 V ±3 V, ±5 V - 0.108MΩ 13.98dB - 80dB - 1 Surface Mount MSOP 8 Rail to Rail Output
RS庫存編號 451-5196
製造零件編號INA148UA
TWD201.00
單位
Dual, Single 3 V, 5 V, 9 V, 12 V, 15 V, 18 V, 24 V, 28 V ±12 V, ±15 V, ±3 V, ±5 V, ±9 V 5mV 2MΩ 0dB - 70dB - 1 Surface Mount SOIC 8 -
RS庫存編號 647-665
製造零件編號INA106KP
TWD442.00
單位
Dual - ±15V 0.5mV 0.11MΩ 20dB - 86dB - 1 Through Hole PDIP 8 -
RS庫存編號 759-1297
製造零件編號AD8276ARZ
TWD100.00
單位
Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 1 Surface Mount SOIC 8 Rail to Rail Output
RS庫存編號 759-0055
製造零件編號AD8277ARZ
TWD147.00
單位
Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 2 Surface Mount SOIC 14 Rail to Rail Output
RS庫存編號 759-0042
製造零件編號AD8276ARMZ
TWD107.00
單位
Dual, Single 2 → 36 V ±2 → ±18V 0.5mV 0.08MΩ - 550kHz 80dB - 1 Surface Mount MSOP 8 Rail to Rail Output