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Hi,
I'm trying to use a zener diode (18.5V) reverse bias to ground with a source voltage that can range from 9 V to 30 V...I basically want the diode to conduct and regulate the voltage to 18.5 once the voltage gets that high. I'm using a 1 k resistor in series with the source, but get a very...
Hi, whats the easiest way to transform a 12 bit unsigned variable into a 16 bit unsigned variable where the additional 4 bits equal to the 12th bit of the original variable? (sign extension)
ie. 0xF0A -> 0xFF0A
ie. 0xA12 -> 0xFA12
ie. 0x612 -> 0x0612
thanks.
In the C programming language.
I currently have a LNA (input as DC blocking cap, 1000pF)...and on the output i have another DC blocking cap (1000pF) and that enters a pi attenuator set for 10dB (75 ohms, series, 100 ohms parallel), that ends up going into a IQ demodulator (50 Ohm impedance)...
is another 1000pF DC blocking...
Thanks keith, I had some 0.1 uF bypass caps on the output, after removal, the oscillation went away...what causes this? and is it okay to have capacitance on the input to the op-amp?
Hi everyone,
I'm using the AD8630 to buffer some DC reference voltages...
I have basically tied the output to the negative input to get +1 gain, to use as a buffer.
However, I'm noticing the output is oscillating, the input to the chip is a clean DC source, but the output oscillates...do I...
to minimize noise, how does one correctly shield a differential pair going across 50meters+? I am using twisted pair and shielding the pair...now does the shield need to be grounded at the transmitter and receiver...also, I've seen a ground also sent with the twisted pair inside the shield...is...
Hi, I've seen people connect the output of a linear regulator to a diode forward biased with the other end connected to the input of the regulator...whats the purpose of this diode?
voltage input---> REGULATOR------->output to load
| |...
Is there any issues with choosing a switching power regulator that can provide a lot more current than a circuit needs...
for example..
I chose a linear tech, switching regulator capable of delivering up to 8 amps max.
What if the circuit only needs 1 or 2 amps, based on the datasheet the...
Hi im trying to figure out what power rating i need for a resistor (ie. 1/10 W, etc)
from what i read, the power rating is the power across the resistor..is this right?
To calculcate it, do I just find the power by (v^2)/Resistance...
where v is the difference in voltage on both sides of the...
Hi I want to multiply a 12 bit fixed point (1QN format CORDIC format). sign bit, integer bit, and 10 fractional bits, with another integer value. say decimal 360.
What needs to be done to do the multiplication correctly and still prevent overflow and misinterpretation of the result?
Thanks...
I'm using a Xilinx spartan FPGA and want to write some VHDL where I can register the output (10 bit) of an ADC. I continuously clock the ADC at 50Mhz and the rest of the FPGA runs on the rising edge of the 50Mhz clock, I want to be able to register the ADC data on the falling edge of the clock...
I'm trying to calculate the phase of a signal by digitizing the inphase and quadrature parts and then doing an digital ARCTAN(Q/I) function on it. My question is, what happens when the inphase component=0? and is there anything you can do about it.
Thanks.
Hi, I have several voltage regulators on my board, what the the most accurate way of measuring independent current for each regulator? I had originally placed in a 0 ohm series resistor at the output of the regulator..that way I can always place in say a 1 Ohm in later and measure the voltage...
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