Pdf development of a programmable gain amplifier pga for 1. The programmable gain amplifier pga is used for amplifying and filtering raw data from a miniature preamplifier, for example, a mpa32i. The gain, input, reference, and output bus enable are set by the user from tables of values in the device editor. Using a lownoise input amplification stage and an ultralinear output driver amplifier, the device generates extremely low distortion products at the high output power levels required by docsis 3. Pga can be used as a unity gain amplifier to buffer the inputs of lower impedance blocks, including mixers or.
Sets the amplifier gain to a value between 1 and 50. Microchips family of programmable gain amplifiers and operational amplifiers are suitable for low power, precision and general purpose applications. The design is based on a general purpose op amp and a digital potentiometer as one of the gainsetting elements. This paper proposes a programmable gain amplifier pga. The pga implements an opampbased, noninverting amplifier with userprogrammable gain.
A programmable gain amplifier for automated gain control in. Programmable gain amplifier pga cypress semiconductor. The programmable gain amplifier the proposed implementation of a programmable gain amplifier consists of a variable gain amplification vga structure that has its gain set by a digital control word and is presented as follows. Programmable gain instrumentation amplifier ad8251 rev. The output of the programmable gain amplifier has a twopart. Gain is distributed around the filter to accommodate and remove out of band signals larger than the inband signal of interest without signal clipping. This amplifier has high input impedance, wide bandwidth and selectable input voltage reference. This simple and lowcost digitally programmable gain amplifier design creates noninverting gains ranging from 6db 2vv to 60db vv. Creatorz component datasheet page 6 of 16 document number. Programmable gain amplifier pga manual multichannel systems. Lowcost digitally programmable gain amplifier reference.
An additional three resistors allow the user to set any gain from 1 to 10,000. The mcp6s21268 precision programmable gain amplifiers pgas are programmable over an spi bus and thus add gain control and input channel selection to the embedded control system. Programmable gain amplifiers with 16, 32, and 64 input channels are available under the name pga16, pga32, and pga64, respectively. If the pga is switched off, the last gain settings are stored. A software programmable gain amplifier spga can be configured with the addition of a cmos multiplexer or other switch network, and a suitable resistor network. High commonmode voltage, programmable gain difference amplifier ad628 rev. The digital potentiometer is controlled with a standard i2c digital interface. Development of a programmable gain amplifier pga for 1 gbits ethernet receivers in 28 nm cmos. However, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. A programmable gain amplifier for automated gain control. It features programmable differential gains from 0. You can find detailed information about this block in the applicable device datasheet and technical reference manual trm. G information furnished by analog devices is believed to be accurate and reliable. The amplifier has high input impedance, wide bandwidth, and selectable input voltage reference.
Circuit simulation proves the functionality of the proposed pga for automated gain control in ci applications. While not attempting to list every possible application, it presents several basic circuit. The pga281 is a highprecision instrumentation amplifier with a digitally. Gains of 1, 10, or 100 are digitally selected by two cmosttlcompatible in. Amplifiers can be ordered with any bandwidth configurations by the users choice. For low noise, high cmrr, and low drift the ad625jn is the most cost effective instrumentation amplifier solution available. The pga103 is a programmablegain amplifier for general purpose applications.
Access to the output amplifiers input terminals allows it to be easily configured as a programmablegain amplifier pga suitable for ac gain control. Because the on resistance of the switches is removed from the signal path, an ad625 based spga will deliver 12bit precision, and can be. Pga281 data sheet, product information and support. The ara2017 is a highly linear, high output power, programmable gain amplifier optimized for docsis 3. The gain, of the programmable gain amplifier, is set by programming the selectable tap in a resistor array and the feedback tap in a continuous time analog psoc block.
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