What Is Beta Ratio In CMOS

What Is Beta Ratio In CMOS?

CMOS stands for complementary metal-oxide-semiconductor, one of the world’s most important types of integrated circuits

Beta Ratio CMOS describes a type of amplifier circuit used in digital electronics. This ratio is determined by the beta coefficient of the transistor, which affects the gain of the amplifier. Understanding how this ratio works can more effectively design and troubleshoot digital circuits. In today’s blog post, we’ll take a closer look at Beta Ratio CMOS and how it affects your designs. 

What Is CMOS Beta Ratio?

The beta ratio in CMOS measures the current gain of the transistor. It is calculated by dividing the collector current by the base current. The higher the beta ratio, the greater the current gain.

What Is A CMOS Inverter?

What Is A CMOS Inverter

“CMOS” means “complementary-symmetry metal–oxide–semiconductor” in the short term. It is pronounced as “see mos.” CMOS is a type of MOSFET. For logic function.” 


It is made by putting together pairs of P-type and N-type MOSFETs that are complementary and symmetrical.

The main features of CMOS devices are low static power consumption and high noise immunity. Everyone agrees that the inverter is the basic logic gate when working with a single I/P variable and a Boolean operation. 

By adding A to A’, you can make a logic variable with a simple inverter circuit. So, a CMOS inverter is an uncomplicated circuit of two MOSFETs with opposite polarities that work together. This content is an overview of how the CMOS inverter works and how it can be used.

A CMOS inverter is a device that is used to make logic functions. It is the most essential part of all integrated circuits. A CMOS inverter is a field effect transistor, or FET, made up of a metal gate on top of an insulating layer of oxygen on top of a semiconductor. Most electronic devices that make data in small circuits use inverters.

How Does A CMOS Inverter Work?

How Does A CMOS Inverter Work

The CMOS inverter works the same way as other FETs but uses an oxygen layer to split the electrons between the gate and the semiconductor. They have a power supply, an input voltage terminal, an output voltage terminal, a gate, a drain, and PMOS and NMOS transistors connected to the gate and drain terminals.

When the CMOS inverter is given a low input voltage, the PMOS transistor turns on, and the NMOS transistor turns off. This lets electrons flow through the gate terminal and produces a high logic output voltage.

In the same way, when a high input voltage is given to a CMOS inverter, the PMOS transistor is turned off, and the NMOS transistor is turned on. This prevents as many electrons as possible from reaching the output voltage, which makes the logic output voltage low.

So, a direct current flows from the supply voltage (VDD) to the output voltage (Vout) and can charge the load capacitor (CL). This shows that Vout = VDD. The above circuit works like an inverter because of this.

CMOS Advantages And Disadvantages

CMOS Advantages And Disadvantages


Some of the advantages of a CMOS inverter are listed below.

  • The steady-state power used by the CMOS inverter is almost nothing except for a small amount of power used by leakage currents.
  • The voltage transfer characteristic (VTC) shows a full o/p voltage swing between 0 V and VDD, and the change between the two is usually very sharp. So, the CMOS inverter looks like an ideal inverter because of how it works.
  • These inverters only use electricity when turned ON and OFF, so they use less power. Because of this, these inverters waste very little heat, so they are very efficient and can be used in small, sensitive electronic devices.
  • The high noise immunity of these inverters lets them block both frequency spikes coming in and going out.
  • These are cheap to make in large quantities.


  • The following are some of the issues with CMOS inverters.
  • The switching rate of the CMOS inverter is faster than that of other inverters.
  • These are hard to make because both transistors are on the same piece of Silica.
  • The inverter has two transistors, so it takes up more space on the IC than the NMOS inverter.

CMOS Inverter Technical FAQ  

What Is CMOS Beta Ratio?

What is CMOS inverter gain?  

Out. (V) Gain=-1. When VDD goes down, the gain of the inverter actually goes up. At 0.5V VDD, which is just 100mV above the transistors’ VT.

What is the switching threshold of a CMOS inverter?  

Suppose you have the transfer characteristics of an inverter in cadence virtuoso. Then the switching threshold is the point on the curve where vin=vout. To find this point, draw the line vin=vout over the curve, and where it meets the inverter’s transfer curve is the switching threshold.

What is the input resistance of a CMOS inverter?

The CMOS inverter has a very high input resistance because it is a perfect insulator and doesn’t use any dc input source.


CMOS technology dominates the market for digital integrated circuits due to its advantages over older technologies. CMOS has a near-zero standby power consumption and can be fabricated in various process technologies, which makes it compatible with a wide range of devices. Its major disadvantage is that it is susceptible to noise, which can cause errors in the output signal.


The beta ratio in CMOSWhich is better, TTL or CMOS?

TTL input levels are somewhat standardized, and many logic inputs still say “TTL compatible,” so it’s not unusual for a CMOS to drive a TTL output stage for compatibility. When it comes to utility, CMOS is the clear winner.

Why is CMOS immune to noise?

The noise immunity of a CMOS logic gate depends on many things, such as the differences between chips, fan-in and fan-out, stray inductance and capacitance, supply voltage, where the noise is coming from, how it looks, and the temperature. Also, the immunity of a system of gates is often different from the immunity of a single gate.

Watch: What is a CMOS? [NMOS, PMOS]

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