8.3.1.16 VIN The UCC2897A controller is equipped with a high-voltage N-channel-JFET startup device to initiate operation from the input-power source of the converter in applications where the input voltage does not exceed the 110-V maximum rating of the startup transistor. In these ...
with a 1 µF hold capacitor. The JFET’s have much lower noise than MOS devices used in previous designs and do not exhibit high temperature instabilities. The overall design guarantees no feed-through from input to output in the hold mode, even for input signals equal to the supply...
with the low-impedance discharge resistor24between the positive conductor16and the negative conductor18. The discharge switch26in this embodiment may be an N-channel depletion mode MOSFET device, or a JFET device, or another suitable device that operates as described herein. The discharge switch26...
7.13 AM RF AGC control The AM front-end is designed for the application of an external Junction Field Effect Transistor (JFET) low noise amplifier with cascode AGC and PIN diode AGC both controlled by an integrated AGC control circuit. Four AGC thresholds of the detector at the first mixer ...
$68 | A more recent, still in production version of the original RAT design featuring the new OP07 Op-Amp. Its tone is a tad more aggressive and bright, and features the always useful Filter control, sporting the rock-solid build design of its predecessor. Thomann |Reverb|Amazon Pro Co L...
This circuit accomplishes this using a p-channel JFET (Q6) and a divider resistor (R20). The gate of the JFET is connected to the SS pin (pin 4) of the UCC25600, which is initially low during converter start up. The JFET places the divider resistor in circuit during the period that...
without having sta-bility problems.Input impedance of 1010Ωallows high source impedances to be used without degrading accuracy.P-channel junction FET’s are combined with bipolar devices in the output amplifier to give droop rates as low as 5mV/min with a 1µF hold capacitor.The JFET’s...
The gate of a JFET must be reverse biased to turn it off and leakage on its output cannot be avoided. MOS switches with gate-protection diodes are preferred in production situations as they are less sensitive to damage from static charges in handling. If used, D1 and R2 should be ...
8.3.1.16 VIN The UCC2897A controller is equipped with a high-voltage N-channel-JFET startup device to initiate operation from the input-power source of the converter in applications where the input voltage does not exceed the 110-V maximum rating of the startup transistor. In these ...
The 5% adjustment is made by pulling the appropriate margin control input directly to the GND terminal.[2] A low-leakage open-drain device, such as an n-channel MOSFET or p-channel JFET is recommended for this purpose.[3] Adjustments of less than 5% can also be accommodated by adding ...