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Designing A Voltage Controlled oscillator. | Cypress Semiconductor

Designing A Voltage Controlled oscillator.

Summary: 6 Replies, Latest post by rahulram on 10 Aug 2012 11:37 AM PDT
Verified Answers: 0
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rahulram's picture
Cypress Employee
115 posts

Hi ppl,

I would like to give a small task  to the forum followers.

Please come up with as many different possibilities of designing VCO in PSoC Creator without using a single external component. In the course of it we shall explore a lot about PSoC.

user_1377889's picture
User
10803 posts

Why is your goal not to use any external components (not even a C). I feel like that will restrict the capabilities of that VCO.

 

Bob

user_1377889's picture
User
10803 posts

Oh, and the last episode of Dave van Ess's PSoCToday shows a digital solution of a VCO, have a look at that video...

Bob

user_14586677's picture
User
7648 posts

Is VCO to be striclty analog, albeit SC allowed, like an integrator, or a

digital approach, like use of A/D, DAC, PWM  ?

 

I concur, the restriction, no external cap, severly limits allowed range

due to small siz of onchip caps and leakage current.

 

Regards, Dana.

 

 

user_1377889's picture
User
10803 posts

Here is a digital solution:

ADC -> DMA -> Timer

When another waveform than a square is desired, a WAVEDAC may follow the timer.

 

Bob

H L
user_460349's picture
User
1362 posts

The easiest way to do it is to use ADC and set a free running counter with the value based on the ADC.

 

rahulram's picture
Cypress Employee
115 posts

 well people, very cool replies.

i guess we can use a Cmod Capacitor onboard (cap used for capsense)along with idac (remember idacs can be made to both source and sink currents). no counters,no adcs required.

can somebody frame the circuit for it? we will actually end up with a peculiar result. we can keep exploring on it.

 

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