Current-booster
The LT1012 corrects errors in the booster stage and does not set high-frequency signals. Fast signals are fed directly to the stage via Q5 and the 0.01 µF coupling capacitors. DC and low-frequency signals drive the stage via the op-amp's output. The output stage consists of current sources, Q1 and Q2, driving the Q3-Q5 and Q4-Q7 complementary emitter followers. The diode network at the output steers drive away from the transistor bases when output current exceeds 250 mA, providing fast short-circuit protection. The circuit's high-frequency summing node is the junction of the 1 kΩ and 10 kΩ resistors at the LT1012. The 10 kΩ/39 pF pair filters high frequencies, permitting accurate DC summation at the LT1012's positive input. This current-boosted amplifier has a slew rate in excess of 1000 V/µs, a full power bandwidth of 7.5 MHz, and a 3-dB point of 14 MHz.
The LT1012 is a precision operational amplifier designed for high-performance applications, particularly in signal processing where accuracy and speed are paramount. The architecture of the LT1012 includes a booster stage that corrects signal errors, ensuring that the output remains stable and accurate even when subjected to varying input conditions. High-frequency signals are directly coupled to the stage through Q5, utilizing 0.01 µF capacitors to maintain signal integrity while preventing distortion.
In this configuration, the op-amp's output serves as the interface for DC and low-frequency signals, allowing for effective control and modulation of the output stage. The output stage employs a pair of current sources, Q1 and Q2, which drive complementary emitter followers (Q3-Q5 and Q4-Q7). This design enhances the output drive capability, ensuring that the amplifier can handle significant load currents while minimizing voltage drop and distortion.
A critical feature of this design is the inclusion of a diode network at the output. This network is crucial for protecting the transistors from excessive current conditions, effectively redirecting drive away from the bases when the output current exceeds 250 mA. This mechanism provides rapid short-circuit protection, thus enhancing the reliability and longevity of the amplifier in demanding applications.
The high-frequency summing node, formed at the junction of the 1 kΩ and 10 kΩ resistors, is pivotal for maintaining the operational amplifier's performance at elevated frequencies. The combination of a 10 kΩ resistor and a 39 pF capacitor acts as a filter for high-frequency signals, allowing for precise DC summation at the positive input of the LT1012. This filtering capability is essential for applications requiring accurate signal processing and measurement.
The LT1012's specifications highlight its prowess as a current-boosted amplifier, boasting a slew rate exceeding 1000 V/µs. This high slew rate enables the amplifier to respond rapidly to changes in input signals, making it suitable for applications where speed is critical. The full power bandwidth of 7.5 MHz and a 3-dB point of 14 MHz further underscore the amplifier's ability to handle a wide range of frequencies without significant loss of performance, making it an excellent choice for high-speed data acquisition and processing tasks.The LT1012 corrects de errors in the booster stage, and does not set high-frequency signals. Fast signals are fed directly to the stage via Q5 and the 0.01-uF coupling capacitors. De and low-frequency signals drive the stage via the op-amp"s output. The output stage consists of current sources, Q1 and Q2, driving the Q3-Q5 and Q4-Q7 complementary emitter follows. The diode network at the output steers drive away from the transistor bases when output current exceeds 250 mA, providing fast short-circuit protection.
The circuit"s high frequency summing node is the junction of the 1-K and 10-K resistors at the LT1012. The 10 K/39 pF pair filters high frequencies, perruitting accurate de summation at the LT1012"s positive input.
This current-boosted amplifier has a slew rate in excess of 1000 Vii"s, a full power bandwidth of 7.5 MHz and a 3-dB point of 14 MHz. 🔗 External reference
The LT1012 is a precision operational amplifier designed for high-performance applications, particularly in signal processing where accuracy and speed are paramount. The architecture of the LT1012 includes a booster stage that corrects signal errors, ensuring that the output remains stable and accurate even when subjected to varying input conditions. High-frequency signals are directly coupled to the stage through Q5, utilizing 0.01 µF capacitors to maintain signal integrity while preventing distortion.
In this configuration, the op-amp's output serves as the interface for DC and low-frequency signals, allowing for effective control and modulation of the output stage. The output stage employs a pair of current sources, Q1 and Q2, which drive complementary emitter followers (Q3-Q5 and Q4-Q7). This design enhances the output drive capability, ensuring that the amplifier can handle significant load currents while minimizing voltage drop and distortion.
A critical feature of this design is the inclusion of a diode network at the output. This network is crucial for protecting the transistors from excessive current conditions, effectively redirecting drive away from the bases when the output current exceeds 250 mA. This mechanism provides rapid short-circuit protection, thus enhancing the reliability and longevity of the amplifier in demanding applications.
The high-frequency summing node, formed at the junction of the 1 kΩ and 10 kΩ resistors, is pivotal for maintaining the operational amplifier's performance at elevated frequencies. The combination of a 10 kΩ resistor and a 39 pF capacitor acts as a filter for high-frequency signals, allowing for precise DC summation at the positive input of the LT1012. This filtering capability is essential for applications requiring accurate signal processing and measurement.
The LT1012's specifications highlight its prowess as a current-boosted amplifier, boasting a slew rate exceeding 1000 V/µs. This high slew rate enables the amplifier to respond rapidly to changes in input signals, making it suitable for applications where speed is critical. The full power bandwidth of 7.5 MHz and a 3-dB point of 14 MHz further underscore the amplifier's ability to handle a wide range of frequencies without significant loss of performance, making it an excellent choice for high-speed data acquisition and processing tasks.The LT1012 corrects de errors in the booster stage, and does not set high-frequency signals. Fast signals are fed directly to the stage via Q5 and the 0.01-uF coupling capacitors. De and low-frequency signals drive the stage via the op-amp"s output. The output stage consists of current sources, Q1 and Q2, driving the Q3-Q5 and Q4-Q7 complementary emitter follows. The diode network at the output steers drive away from the transistor bases when output current exceeds 250 mA, providing fast short-circuit protection.
The circuit"s high frequency summing node is the junction of the 1-K and 10-K resistors at the LT1012. The 10 K/39 pF pair filters high frequencies, perruitting accurate de summation at the LT1012"s positive input.
This current-boosted amplifier has a slew rate in excess of 1000 Vii"s, a full power bandwidth of 7.5 MHz and a 3-dB point of 14 MHz. 🔗 External reference