Hi there I have a charge amplifier, used to amplify the signal from a piezo electric transducer, with 2nF of reference capacitance shunted...

Hi there I have a charge amplifier, used to amplify the signal from a piezo electric transducer, with 2nF of reference capacitance shunted with 1GOhm. I need to be able to reset the amplifier, preferably with a solid state device (the circuit has to be very compact, and operate in a high-vibration environment). One possibility which comes to mind is to simultaneously short the amplifier ou...

Could some electronics guru here clarify this a bit ? The efffiiciency definition for an amplifier is Power delivered to load/DC power supplied...

Could some electronics guru here clarify this a bit ? The efffiiciency definition for an amplifier is Power delivered to load/DC power supplied by power source The Dc power supplied from power supply is Vdc x avg. DC current flowing into amplifier However, Vdc changes, as per design requirements of class G amplifier. So what then would be the efficiency defintion for a class G amplifier. ...

I read this post in an antenna group and I don't get how this guy is coming up with a negative noise figure. Looks to me like he is...

I read this post in an antenna group and I don't get how this guy is coming up with a negative noise figure. Looks to me like he is calculating the noise figure of a resistor, not the amplifier. Anyone care to explain this to me? The part that seems bogus is this... > The negative NF is defined as the amplifier noise being less than the > increase in noise due to the amplifier gai

Op-amp differential amplifier has much wider range of input signals comparing to differential amplifier with discrete components. Read...

Op-amp differential amplifier has much wider range of input signals comparing to differential amplifier with discrete components. Read more: http://www.cirvirlab.com/index.php/tutorials/170-op-amp-differential-amplifier-simulation.html and also simulate: http://www.cirvirlab.com/simulation/op-amp-differential-amplifier-online.php

The standard treatment of amplifier stability is based on small signal S parameters, and involves conditional stability, unconditional...

The standard treatment of amplifier stability is based on small signal S parameters, and involves conditional stability, unconditional stability, Rollet's criterion, etc., What about steady state amplifier operation, is there an analytical way to estimate this ?

Anyone have an off-the-shelf 2.2-2.4GHz amplifier they like? ~10W is what I'm after. Mini-Circuits has their ZHL-30W-252+ which would be fine,...

Anyone have an off-the-shelf 2.2-2.4GHz amplifier they like? ~10W is what I'm after. Mini-Circuits has their ZHL-30W-252+ which would be fine, although at $3k I'm continuing to do a bit of searching... (And before anyone asks, no, I'm not building a high-power WiFi amplifier and, yes, I do have the appropriate FCC license to put this thing on the air -- with various restrictions on t...

Hi, I've been designing a "network audio client" (aka "network loudspeaker") and now have to select a suitable amplifier to use in it. 1)...

Hi, I've been designing a "network audio client" (aka "network loudspeaker") and now have to select a suitable amplifier to use in it. 1) The amplifier's presence is "optional" (e.g., when interfacing to external equipment via a "line out", the amplifier is superfluous) 2) The design is intended to support one or two audio channels (e.g., drive a single speaker -- BTL? -- or a pair WH...

Seeking the opinions of gurus on this newsgroup. The bare bones class B amplifier has zero base|gate bias. A class F amplifier is an extension of...

Seeking the opinions of gurus on this newsgroup. The bare bones class B amplifier has zero base|gate bias. A class F amplifier is an extension of the class B with harmonic tuning. So, is class B linear or non-linear.

Could some electronics guru here please clarify this a bit ? I have been experimenting SPICE RF amplifier designs in my spare time,and I am...

Could some electronics guru here please clarify this a bit ? I have been experimenting SPICE RF amplifier designs in my spare time,and I am getting confused by the differences between textbook expressions for amplifier efficiency etc., and my experimental findings. Consider the textbook definition for efficiency as: efficiency = Power delivered to load/DC power supplied First, the p...

Hi I need to drive a coil with 40Vpp at 10kHz to 20MHz for a test Tried to find gear that would do that, but they all have 50 ohms output...

Hi I need to drive a coil with 40Vpp at 10kHz to 20MHz for a test Tried to find gear that would do that, but they all have 50 ohms output Anyone got a link for a amplifier that can do this? Thanks Klaus

Hello, I'm trying to make a voltage controlled amplifier. I only need a gain of about 11 max. So I thought I would use an opto as a variable...

Hello, I'm trying to make a voltage controlled amplifier. I only need a gain of about 11 max. So I thought I would use an opto as a variable resistor on an inverting amplifier. I went with the H11F3M https://www.fairchildsemi.com/datasheets/H1/H11F3M.pdf I built up the Automatic Gain Control circuit in the datasheet. I used a 50k resistor as my feedback resistor. When I fired it up, my...

On Thursday, May 14, 2015 at 4:08:04 AM UTC-7, Phil Hobbs wrote: > > Oh and I'm fairly certain the non-inverting amplifier is wired up...

On Thursday, May 14, 2015 at 4:08:04 AM UTC-7, Phil Hobbs wrote: > > Oh and I'm fairly certain the non-inverting amplifier is wired up correctly. Between > > switching back and forth from the non-inverting to the inverting configuration > > several times, I am fairly certain that both configurations were wired up properly. > > Hmm... "several times" does make it sound like a

On Thu, 14 May 2015 04:07:59 -0700 (PDT), Phil Hobbs wrote: > > Oh and I'm fairly certain the non-inverting amplifier is wired up...

On Thu, 14 May 2015 04:07:59 -0700 (PDT), Phil Hobbs wrote: > > Oh and I'm fairly certain the non-inverting amplifier is wired up correctly. Between > > switching back and forth from the non-inverting to the inverting configuration > > several times, I am fairly certain that both configurations were wired up properly. > > Hmm... "several times" does make it sound like a so

On 05/14/2015 11:52 AM, Felipe Jimenez wrote: > On Thursday, May 14, 2015 at 4:08:04 AM UTC-7, Phil Hobbs wrote: > > > Oh and I'm fairly...

On 05/14/2015 11:52 AM, Felipe Jimenez wrote: > On Thursday, May 14, 2015 at 4:08:04 AM UTC-7, Phil Hobbs wrote: > > > Oh and I'm fairly certain the non-inverting amplifier is wired up > > > correctly. Between switching back and forth from the > > > non-inverting to the inverting configuration several times, I am > > > fairly certain that both configurations were wired up properly. > > > > Hmm... "se

Hello all, I have a basic instrumentation amplifier made with three MAX 44245 op amps. My problem is that I have too much noise in the 50 to...

Hello all, I have a basic instrumentation amplifier made with three MAX 44245 op amps. My problem is that I have too much noise in the 50 to 100 kHz bandwidth and I don't know how to reduce it. Maybe I don't have enough phase margin around 100 kHz (the GBW product of the 44245 is 1 MHz and the gain of the first stage of the instr. amplifier is about 10). However, the data sheet says that t...

I'm currently researching the amplifier options for the output stage of a R= F receiver I'm designing. This stage will have a single-ended output...

I'm currently researching the amplifier options for the output stage of a R= F receiver I'm designing. This stage will have a single-ended output and wi= ll drive an ADC that has a SFDR of 100 dB. Of course, I need a highly linea= r amplifier to prevent washing out my ADC performance, but I don't want to = use one with differential I/O, which is typically used to drive high-perfor= mance ADCs...

On 05/14/2015 11:50 AM, John Larkin wrote: > On Thu, 14 May 2015 04:07:59 -0700 (PDT), Phil Hobbs > wrote: > > > > Oh and I'm fairly...

On 05/14/2015 11:50 AM, John Larkin wrote: > On Thu, 14 May 2015 04:07:59 -0700 (PDT), Phil Hobbs > wrote: > > > > Oh and I'm fairly certain the non-inverting amplifier is wired up correctly. Between > > > switching back and forth from the non-inverting to the inverting configuration > > > several times, I am fairly certain that both configurations were wired up properly. > >

Generally, if input stage of an operational amplifier is realized as BJT tr= ansistor differential amplifier, op-amp has smaller slew rate,...

Generally, if input stage of an operational amplifier is realized as BJT tr= ansistor differential amplifier, op-amp has smaller slew rate, smaller volt= age offset and better CMRR. If it's realized as JFET transistor based diffe= rential amplifier, voltage offset is higher, CMRR is smaller but slew rate = is better.=20 Read more: http://www.cirvirlab.com/index.php/tutorials/167-bjt-tran...

Is it possible to calculate the amplification factor for an amplifier,, e.g., a common emitter amplifier. This is because the amplification...

Is it possible to calculate the amplification factor for an amplifier,, e.g., a common emitter amplifier. This is because the amplification depends very much on the biasing condition, and so without a SPICE simulation, it appears impossible to determine the amplification factor. Am I right/wrong.

On 05/14/2015 12:15 PM, George Herold wrote: > On Thursday, May 14, 2015 at 11:57:36 AM UTC-4, Phil Hobbs wrote: > > On 05/14/2015 11:50 AM,...

On 05/14/2015 12:15 PM, George Herold wrote: > On Thursday, May 14, 2015 at 11:57:36 AM UTC-4, Phil Hobbs wrote: > > On 05/14/2015 11:50 AM, John Larkin wrote: > > > On Thu, 14 May 2015 04:07:59 -0700 (PDT), Phil Hobbs > > > wrote: > > > > > > > > Oh and I'm fairly certain the non-inverting amplifier is > > > > > wired up correctly. Between switching back and forth from the > > > > > non