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Type: Posts; User: BigBoss

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1. ## Thread: bipolar active linear region

by BigBoss
Replies
2
Views
183

### Closed: Re: bipolar active linear region

Your definition Vbc<0 is not correct.
Exact statement should be B-C junction is reverse biased for Linear region,Forward biased for Saturation Region.
So B-C junction is forward biased whilst the...
2. ## Thread: Interpreting NF Circle ang Gain circle for matching network

by BigBoss
Replies
7
Views
465

### Closed: Re: Interpreting NF Circle ang Gain circle for matching network

Is it a joke ?? Everything is short circuited..
Read on simulation techniques much.There are millions app notes and papers about it.
3. ## Thread: Interpreting NF Circle ang Gain circle for matching network

by BigBoss
Replies
7
Views
465

### Closed: Re: Interpreting NF Circle ang Gain circle for matching network

Gamma_L is used for Power Gain ..
4. ## Thread: Interpreting NF Circle ang Gain circle for matching network

by BigBoss
Replies
7
Views
465

### Closed: Re: Interpreting NF Circle ang Gain circle for matching network

NFmin is a single point and NF Circles are rounding this point by sacrificing NF value.So the best NF can be obtained at that point only, then first circle covers more points ( impedance values ) by...
5. ## Thread: Getting nonlinear model for JFET and GaAsHEMT transistor

by BigBoss
Replies
9
Views
899

### Closed: Re: Getting nonlinear model for JFET and GaAsHEMT transistor

-You will design a simple LNA so you don't have to simulate this simple circuit.All you need a simple Vgs Voltage generator trough a Bias Stub ( or equivalent). When you you test your circuit adjust...
6. ## Thread: Getting nonlinear model for JFET and GaAsHEMT transistor

by BigBoss
Replies
9
Views
899

### Closed: Re: Getting nonlinear model for JFET and GaAsHEMT transistor

Nonlinear Models are not %100 necessary for a good design.All you have to do is to design a matching circuit for Lowest Noise with a appropriate biasing circuit mentioned in the datasheet.
Noise...
7. ## Thread: How to design RF mixer

by BigBoss
Replies
3
Views
420

### Closed: Re: How to design RF mixer

What type of Mixer you would to design ??
-Integrated or Discrete ?
-Active or Passive ?
-Diode or Transistor ?
-Single Balanced or Double Balanced or Triple balanced ?
-Specs ??
Questions...
8. ## Thread: SMA-Microstrip transition removal for large-signal measurement of PA

by BigBoss
Replies
26
Views
1,312

### Closed: Re: SMA-Microstrip transition removal for large-signal measurement of PA

Now I have seen the problem..As I said before.. GND connection is too poor.
9. ## Thread: SMA-Microstrip transition removal for large-signal measurement of PA

by BigBoss
Replies
26
Views
1,312

### Closed: Re: SMA-Microstrip transition removal for large-signal measurement of PA

Your test board is not so good at all..Ground connections are extremely sensitive at RF frequencies and its' GND connections are very poor.
Find a polished aluminum mass and make the connectors' GND...
10. ## Thread: Colpitts oscillator stability analysis

by BigBoss
Replies
5
Views
549

### Closed: Re: Colpitts oscillator stability analysis

Ulrich Rohde has an in-depth analytical textbook about oscillators.I recommend it to follow..The Design of Modern Microwave Oscillators for Wireless Applications : Theory and Optimization by Ulrich...

by BigBoss
Replies
3
Views
322

### Closed: Re: Difference between ADS simulation and the experimental measurements

Post your layout and schematic here, let's see.
12. ## Thread: can i connect 2 rf amplifiers to get higher amplification?

by BigBoss
Replies
13
Views
875

### Closed: Re: can i connect 2 rf amplifiers to get higher amplification?

Theoretically yes, practically no..

by BigBoss
Replies
15
Views
1,272

### Closed: Re: ADS and S11 Equations for L & C

Plot "ipart" on a Smith Chart and see how reactive part of the Input Impedance changes..
As seen from S11, Input Impedance has no inductive part.

by BigBoss
Replies
3
Views
345

### Closed: Re: SMS7630 Series modeling for small signal in ADS

The additional elements in the first picture are not included model because they are just package parasitics.There isn't any small signal model in your circuit.
The nonlinear model parameters are...
15. ## Thread: Need suggestion to select an (1GHz) Oscilloscope (Tek 5 series Vs R&S RTO2000)

by BigBoss
Replies
3
Views
400

### Closed: Re: Need suggestion to select an (1GHz) Oscilloscope (Tek 5 series Vs R&S RTO2000)

Go with Tektronix in my opinion.
16. ## Thread: Mixer input impedance matching

by BigBoss
Replies
5
Views
403

### Closed: Re: Mixer input impedance matching

Either you calculate or not, nF or uF range of capacitors are not possible by its nature..
17. ## Thread: Convergence problem in RGB CRT-based projection TV

by BigBoss
Replies
5
Views
331

### Closed: Re: Convergence problem in RGB CRT-based projection TV

Convergence is adjusted on Deflection Yoke of the CRT ( I talk about standard CRT TV Tubes ) and this is fixed at the factory but still adjustable..
18. ## Thread: Analog Ground Plane_Determination

by BigBoss
Replies
2
Views
261

### Closed: Re: Analog Ground Plane_Determination

Use separate LDO for both uC and Digital Potentiometer.And use separate GND copper pours for AGND and DGND.
This is important because DGND may have very high noise signals due to switchings and it...
19. ## Thread: Request for RF MOSFE BLF175

by BigBoss
Replies
3
Views
343

### Closed: Re: Request for RF MOSFE BLF175

The RF Transistors that are found in aliexpress may be fake or second hand so I say pay attention..
There are so many claims about them in the internet..
20. ## Thread: Mixer input impedance matching

by BigBoss
Replies
5
Views
403

### Closed: Re: Mixer input impedance matching

Can Input Impedance be in uF or nF range for an RFIC ?? Answer is simple, never...
So, it will logically be pF range..

by BigBoss
Replies
14
Views
816

### Closed: Re: trying to find radio oscillator to use.

Is that oscillator 3 octaves ?? 70-200 MHz.. Check it again..
I have never seen an oscillator more than 2 octaves..
22. ## Thread: How to manage a specific pdk’s nmos HB simulation in Virtuoso ADE?

by BigBoss
Replies
1
Views
90

### Closed: Re: How to manage a specific pdk’s nmos HB simulation in Virtuoso ADE?

Did you enable Device Currents ( ALL ) in Saving Options in ADE ??
23. ## Thread: Target 3001 issues- offboard components and adding television flyback transformer?

by BigBoss
Replies
2
Views
296

### Closed: Re: Target 3001 issues- offboard components and adding television flyback transformer

Do you intend to re-create a out-of-service FB transformer ??
24. ## Thread: how to measure the output of a crystal oscillator?

by BigBoss
Replies
16
Views
870

### Closed: Re: how to measure the output of a crystal oscillator?

32kHZ can be measured easily with modern multimeters but it will probably charge the oscillator by probe capacitance and therefore oscillator may stop.A simple buffer voltage follower will definitely...
25. ## Thread: LDO transient performance enhancement circuit understanding

by BigBoss
Replies
17
Views
1,010

### Closed: Re: LDO transient performance enhancement circuit understanding

Where is your transient source so you expect a transient response ??
You have to change VDD by transient STEP PULSE source to achieve a transient response..Otherwise everything is in steady state...
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