What is CMOS differential amplifier?

CMOS differential amplifiers are more widely used for various applications as compared to single-ended amplifiers. A fully differential amplifier circuit produces two inputs and two outputs. In designing differential amplifiers, sensitivity is an essential specification.

What is differential amplifier explain with diagram?

A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs. It is an analog circuit with two inputs and and one output.

What are the three main CMOS amplifiers?

Telescopic, folded cascode (FC), or recycling FC (RFC) are the most common single-stage amplifiers. All these structures use transistors as active loads to provide higher output resistance (= higher gain) and output swing.

What is the purpose of a differential amplifier?

The differential amplifier circuit amplifies the difference between signals applied to the inputs (Figure 3.5). Superposition is used to calculate the output voltage resulting from each input voltage, then the two output voltages are added to arrive at the final output voltage.

What are the applications of differential amplifier?

Applications of Differential Amplifiers. Generally, we use differential amplifier that acts as a volume control circuit. The differential operational amplifier can be used as an automatic gain control circuit. Some of the differential operational amplifier can be used for Amplitude modulation.

What is the working principle of a differential amplifier?

The differential amplifier circuit amplifies the difference between signals applied to the inputs (Fig. 2.6). Superposition is used to calculate the output voltage resulting from each input voltage, and then the two output voltages are added to arrive at the final output voltage.

How is CMOS used as an amplifier?

In this region, CMOS Inverter can be used as a NOT Gate. Region (3): CMOS inverter can be used as an amplifier because small changes in input voltage (in mV) can cause a large change in output voltage. then both MOSFETs will be in the saturation region and will act as amplifiers.

What is CMOS full form?

The full form of CMOS is the Complementary Metal Oxide Semiconductor. CMOS is an integrated circuit built on a printed circuit board, a widely used kind of semiconductor used in transistors.

What is an ideal differential amplifier?

So, an ideal op amp is defined as, a differential amplifier with infinite open loop gain, infinite input resistance and zero output resistance. The ideal op amp has zero input current. This is because of infinite input resistance.

Why is differential amplifier used?

Differential amplifiers are used mainly to suppress noise. Noise consists of typical differential noise and common-mode noise, of which the latter can easily be suppressed with an op-amp.

What is the advantage of differential amplifier?

Differential amplifiers offer many advantages for manipulating differential signals. They provide immunity to external noise; a 6-dB increase in dynamic range, which is a clear advantage for low-voltage systems; and reduced second-order harmonics.

What is input common-mode range of a differential amplifier?

Input common-mode range (ICMR) The input common-mode range is the range of common-mode voltages over which the differential amplifier continues to sense and amplify the difference signal with the same gain. Typically, the ICMR is defined by the common-mode voltage range over which all MOSFETs remain in the saturation region.

What is a differential amplifier used for?

A differential amplifier is an amplifier that amplifies the difference between two voltages and rejects the average or common mode value of the two voltages. Differential and common mode voltages: v1 and v2 are called single-ended voltages. They are voltages referenced to ac ground.

How do you find the gain of a differential amplifier?

For a fully symmetric differential pair which senses inputs by equal and opposite amounts then the concept of half circuit can be applied to find the gain of the differential amplifier. For the circuit shown in below Figure, by using the concept of half circuit, the small signal gain is given as,

How to design differential amplifiers?

The design of Differential amplifier is an iterative procedure and applications specific. However follo wing steps can be followed in general [3]. 1. Select I 5 based on slew rate specification. 2. T o meet the given f − 3 dB calculate the required R o and modify the I 5 3. Select ( W L) 3, 4 to meet the upper ICMR. 4. Select ( W