Frequently Asked Questions: Amplifiers >> High Speed Amplifiers >> HSA Selection Guide >> Variable Gain Amplifier Selection Guide
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VGAs
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Introduction:
- Variable gain amplifiers (VGAs) that can change its gain based on a control voltage. Also known as voltage controlled amplifiers (VCA ) or digitally controlled VGA (DVGA) where analog voltages control the gain of the amplifier.
Applications:
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Flow Transmitter |
Semiconductor Test & ATE |
Semiconductor Manufacturing | Network Analyzer | Biochemistry Analyzer | |
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In-vitro diagnostics |
Medical Ultrasound |
MRI |
Wireless Communications |
- A list of TI publications related to high speed amplifiers and their applications can be found here: Application Notes
Recommend VGAs Table:
| Devices | BW (MHz) | Iq (mA) | Voltage Noise (nV/√Hz) | Gain Range (dB) | Gain Accuracy (dB) (typ) |
| VCA810 (Diff to Diff) | 30 | 24.8 | 2.4 | -40 to +40 | 0.5dB |
| THS7001 (Diff to SE) | 70 | 5.5 | 1.7 | -20 to 20 | +-7.5% |
| LMH6505 (Diff to SE) | 150 | 11 | 4.4 | set externally 80dB | -- |
| THS7530 (Diff to Diff) | 300 | 40 | 1.1 | +11.6 to +46.5 | 4 |
| LMH6518 | 900 | 210 | 0.98 | -1 to +40 | 0.75dB |
Recommended GHz VGAs Table:
| Devices | BW (GHz) | Iq (mA) | Noise Figure (dB) | Gain Range (dB) | Gain Step size(dB) |
| LMH6401 | 4.5 | 69 | 8 | -6 to +26 | 1 |
| LMH6881 | 2.4 | 50 | 9.7 | 6 to +26 | 0.25 |
Recommended Automotive Qualified VGA Table:
| Devices | BW (MHz) | Iq (mA) | Voltage Noise (nV/√Hz) | Gain Range (dB) | Gain Accuracy (dB) (typ) |
| THS7530-Q1 (Diff to Diff) | 300 | 40 | 1.1 | +11.6 to +46.5 | 4 |