By Gabriel Rincon-Mora
Master Analog Integrated-Circuit Design
Design, learn, and construct linear low-dropout (LDO) regulator ICs in bipolar, CMOS, and biCMOS semiconductor method applied sciences. This authoritative advisor bargains a different emphasis on embedded LDO layout. via intuitive causes and certain illustrations, the publication exhibits how one can positioned those theories to paintings growing analog ICs for the newest moveable, battery-powered devices.
Analog IC layout with Low-Dropout Regulators info the total product improvement cycle-from defining pursuits and choosing elements to blueprinting, assembling, and fine-tuning functionality. paintings with semiconductors, hire destructive suggestions, deal with fluctuating lots, and embed regulators in ICs. additionally, you will tips on how to construct prototypes, practice checks, and combine system-on-chip (SoC) performance. realize how to:
- Design, try, and gather BJT-, MOSFET-, and JFET-based linear regulators
Use present mirrors, buffers, amplifiers, and differential pairs
- Integrate suggestions loops, unfavorable suggestions, and regulate limits
Maintain an self sufficient, sturdy, noise-free, and predictable output voltage
Compensate for low enter present and large voltage swings
- Optimize accuracy, potency, battery existence, and integrity
Implement overcurrent defense and thermal-shutdown features
Establish energy and working limits utilizing characterization suggestions
Read or Download Analog IC Design with Low-Dropout Regulators (LDOs) (Electronic Engineering) PDF
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Additional resources for Analog IC Design with Low-Dropout Regulators (LDOs) (Electronic Engineering)
The regulator) to respond (in Δt1). , when class-A buffer slews) normally govern the extent of response time Δt1, which exceeds the corresponding bandwidth time (1/BWCL). After the circuit has time to react, the pass device responds by supplying load current iLOAD and additional current to charge and slew the output filter capacitors back to their targeted regulated voltage. The regulated output voltage ultimately settles to the voltage corresponding to the new load-current value, which is the ideal voltage minus the load-regulation effect of the loop (ΔVLDR).
8a. Extrinsic Device + Vd Cj RP p n p n Maneuvering technology to build a diode necessarily introduces parasitic junctions and components to the intrinsic device. To start, the diode is a series combination of oppositely doped silicon pieces each of which introduces series parasitic resistances (RP and RN in Fig. 8a). More importantly, however, all devices in an integrated circuit (IC) share a common p- or n-type substrate, isolation from which is normally achieved by reverse biasing all substrate pn junctions, resulting in parasitic depletion capacitances CjN and CjP in p- and n-type substrates, respectively.
In transferring energy, a regulator loses power across its powerconducing series device and through its control loop. , input-voltage difference VIN – VOUT) and its current (ILOAD). , PQ = VIN IQ ). , low VIN) while meeting its regulation objectives. , lowest IQ during light loading conditions). Dropout voltage is often the limiting factor in efficiency performance. From a specification standpoint, the minimum voltage sustained across the pass device when the circuit ceases to regulate is the dropout voltage.