LINEAR Manuals

This document introduces a 30 nanosecond precision broadband amplifier settling time measurement method. This precision broadband amplifier has a 30 nanosecond settling time, which can introduce precision while maintaining high speed operation. The amplifier's DC and AC specifications approach or equal previous devices at significantly lower cost while saving power.

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This document discusses the understanding and application of voltage references, including the accuracy of references and tips for maximizing their performance.

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This application note describes performance verification of low noise, low dropout linear regulators (LDOs), including LDO dropout, input voltage range, maximum output current, noise, stability, surge current, load regulation, output voltage regulation, and thermal characteristics.

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This application note highlights “power” circuits from issue VI:1 (February 1996) through issue VIII:4 (November 1998).

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This document describes the biasing considerations for the varactor diode required for tuning high frequency oscillators, and provides a low noise varactor biasing method.

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This document is about AN86-1 A Standards Lab Grade 20-Bit DAC with 0.1ppm/°C Drift application note

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AN87 is the fifth in a series that excerpts useful circuits from Linear Technology magazine to pre- serve them for posterity. This application note highlights data conversion, interface and signal conditioning circuits from issue VI:1 (February 1996) through issue VIII:4 (November 1998).

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This document introduces the application of capacitors in DC/DC converters and details the problems that may be caused by using ceramic capacitors to filter DC/DC converter inputs.

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This document describes a thermoelectric cooler temperature controller for fiber optic lasers, which can meet the requirements of precise temperature control to maintain stable performance of the laser.

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This is an article about current sources for fiber optic lasers.

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This application note describes several low-cost coupling methods for RF power detectors that replace directional couplers. These methods allow for the integration of RF power detectors on-chip, which reduces cost and size. These methods also allow for the integration of RF power detectors and RF power amplifiers in a single module, which further reduces cost and size.

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This article describes the bias voltage and current sense circuits for avalanche photodiodes (APDs) used in fiber optic systems. The APD module contains an APD and a trans-impedance amplifier, which converts the optical signal into an electrical signal. The APD requires a relatively high bias voltage to operate, typically ranging from 20V to 90V. Additionally, monitoring the APD's average current can indicate the optical signal strength and be used in conjunction with feedback techniques to maintain optimal signal levels.

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This application note describes the use of the LTC1799 precision monolithic oscillator in various instrumentation applications, including transducer circuits, carrier-based amplifiers, sine wave generators, filters, interval generators, and data converters. The LTC1799 is a high-accuracy, high-stability RC oscillator that can be tuned over a wide range.

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Slew rate verification for wideband amplifiers

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This document introduces the simple circuitry for cellular telephone/camera flash illumination, including LED and flashlamp two schemes, and detailed explanation of the flashlamp working principle and characteristics.

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AN98-1 is a TI application note published in 2004. It introduces 18 circuit designs, including voltage controlled current source, signal source, conditioner and power circuit.

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delta sigma adc bridge measurement techniques

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This application note describes a method for accurately measuring the third order intercept point for low distortion IC products such as the LT5514. This includes the test setup, test equipment, test signal and interpretation of the measurement results.

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ACPR (adjacent channel power ratio), AltCPR (alternate channel power ratio), and noise are important performance metrics for digital communication systems that use, for example, WCDMA (wideband code division multiple access) modulation. ACPR and AltCPR are both measures of spectral regrowth. The power in the WCDMA carrier is measured using a 5MHz measurement bandwidth. For ACPR, the total power in a 3.84MHz bandwidth centered at 5MHz (the carrier spacing) away from the center of the outermost carrier is measured and compared to the carrier power. The result is expressed in dBc. For AltCPR, the procedure is the same, except we center the measurement 10MHz away from the center of the outermost carrier. To measure ACPR and AltCPR, refer to the test setup shown in Figure 2. The DUT (device under test) is the LT5528, which is a high linearity direct I/Q modulator. It accepts WCDMA modulation at the baseband inputs, and generates a WCDMA modulated signal at the RF output. Note that a free running RF generator provides the LO signal. This type of generator is used because of its superior noise performance. This is critical, as a noisy LO signal may corrupt the modulator output, and consequently the ACPR measurement. For the generator shown, the automatic level control must be switched off to avoid degrading its broadband noise floor. Also,

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This article discusses the application of linear regulators to post-regulate switching regulator outputs. Linear regulators offer benefits such as improved stability, accuracy, transient response, and lowered output impedance. However, they encounter difficulties in handling the ripple and spikes generated by switching regulators, particularly at higher frequencies. The article focuses on the impact of residual input-derived high-frequency components on the output of linear regulators.

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