☑ Define Binary Weighted Resistor Network

An r2r ladder is a simple and inexpensive way to perform digital to analog conversion using repetitive arrangements of precise resistor networks in a ladder like configuration. A weighted resistor ladder network where the resistance are inversely proportional to the numerical significance of the corresponding binary digital a reference voltage v ref and a summing amplifier that adds the current flowing in the resistive network to develop a signal that is proportional to the digital input.

Solved What Is The Name Of The Dac In The Figure 8 75 C

Dac And Binary Weighted Resistor Dac

Solved Drill Question A Define Binary Weighted Resistor

A binary weighted resistor network.

Define binary weighted resistor network. Output voltage from binary weighted resistor dac is expressed as follows. This produces the desired weighting in the voltage output. Starts with the msb resistor and the resistor value increases by the factor of 2 and op amp summing amplifier.

The binary weighted resistor dac employs the characteristics of the inverting summer op amp circuit. Weighted resistors are used to distinguish each bit from msb to lsb. Vo r f 2 n 1 r 2 n 1 v n 1 2 n 2 v n 2.

The switch positions decides the binary word ie. As we discuss earlier about how digital to analog converters works you may refer that first. Weighted resistor digital to analog converter is a very basic da converter.

In the weighted resistor type dac each digital level is converted into an equivalent analog voltage or current. 2 1 v 1 2 0 v 2. The binary weighted dac which contains individual electrical components for each bit of the dac connected to a summing point typically an operational amplifier.

Transistors are used to switch between vref and ground bit high or low. The following figure shows the circuit diagram of weighted resistor dac. This dac circuit uses weighted values of resistor like 2r 4r 6r 8r and so on depending on the digital inputs available therefore such type of network is known as weighted resistor dac.

A resistor ladder is an electrical circuit made from repeating units of resistors. Binary weighted resistor dac. It is the network used in simple dac using the resistors network.

Resistor networks arrays are available at mouser electronics. Each input in the summing has powers of two values with most current or voltage at the most significant bit. Mouser offers inventory pricing datasheets for resistor networks arrays.

In this type of dac the output voltage is the inverted sum of all the input voltages. By using simple resistor network we can easily build that. Which produces the weighted sum of the input voltages.

Let us consider a n bit straight binary resistor network which produces a current i corresponding to logic 1 at the most significant bit i2 corresponding to logic 1. Two configurations are discussed below a string resistor ladder and an r2r ladder. The following figure shows the circuit diagram of the binary weighted resistor type dac.

It consists of parallel binary weighted resistor bank and a feedback resistor rf.