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Programmable Gain Amplifiers (PGAs) are versatile components that can be used to adjust the gain of a signal. They can be either analog or digital and are typically used to boost a signal that has a low output voltage or current and amplify it to a higher level for further conditioning or processing.
A PGA generally features one or more adjustable gain stages, plus a DC offset adjustment, and output current drive capability. Analog PGAs have the advantage of being able to provide a wide variety of gains, or gain ratios, to suit different applications.
A typical analog PGA will feature a logarithmic taper or linear control with a selector switch for setting the gain range.
This type of PGA is ideal for providing a wide range of gain and is well-suited for applications where the input signal changes considerably over time, such as audio signals or signals from a variety of sensors.
Digital PGAs are usually based on a very simple microcontroller, and as such, are much more limited in their ability to adjust the gain. A digital PGA can provide a fixed number of gains, usually in the range of 8 to 16, and the output from the PGA is usually a digital signal.
This makes digital PGAs well-suited to applications where the signal will remain mostly constant over time, such as a control signal driving an LED or solenoid.
PGAs combine the flexibility of analog circuitry with the convenience and cost efficiency of digital technology. They make it easy to adjust the gain of literally any signal needing amplification, making them a crucial component in a wide variety of applications.
The Global Programmable Gain Amplifier market accounted for $XX Billion in 2023 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2024 to 2030.
A fully differential, zero-drift, 36-V programmable gain amplifier (PGA) was introduced by Texas Instruments. The PGA281 provides the lowest offset voltage in its class, at 5uV, to enhance accuracy and stability over the long run.
Both DC accuracy and long-term stability are made possible by its zero-drift architecture. It also lessens the necessity for system calibration in the future. The PGA281 can be used by designers in medical instrumentation, strain gauges, test and measurement, bridge amplifiers, and industrial signal acquisition applications.
Zero-drift construction: Designers can maximize system performance with an offset voltage of 25 uV an offset voltage drift of 174 nV/C and a maximum gain of 128. The offset voltage offers stability in a broad range of circumstances, such as temperature and time.
Best-in-class CMRR: Compared to competitors, it can reject common mode signals at unity gain by twice as much, or more than 140 dB, over a broad frequency range. This minimizes errors when adjusting for voltage variations.
Extensive internal gain options: Over 20 distinct gain selections are made possible by digitally programmable internal gain options and output scaling capabilities. The device is a versatile front end because of its programmable gain and attenuation, which enable a wide input range of a few millivolts to greater than 20 V.
Internal error detection: The designer can keep an eye on and maintain a clear signal by using an error flag pin to indicate whether an over-voltage or over-load condition has occurred.
