[time-nuts] Buffer / distribution amplifier for TCXO

2010-08-04 Thread Henry Hallam
Dear time nuts, Background: I have built a GPS receiver based around the SE4120L front end IC [1]. I used a KT3225 TCXO [2] at 16.3676MHz driving the front end through a 10nF series capacitor as in the example circuit in [1]. Inside the front end, this oscillator is multiplied up to form a

Re: [time-nuts] Buffer / distribution amplifier for TCXO

2010-08-04 Thread Bruce Griffiths
Henry Hallam wrote: Dear time nuts, Background: I have built a GPS receiver based around the SE4120L front end IC [1]. I used a KT3225 TCXO [2] at 16.3676MHz driving the front end through a 10nF series capacitor as in the example circuit in [1]. Inside the front end, this oscillator is

Re: [time-nuts] Buffer / distribution amplifier for TCXO

2010-08-04 Thread Bob Camp
-- From: Henry Hallam he...@pericynthion.org Sent: Wednesday, August 04, 2010 1:46 PM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] Buffer / distribution amplifier for TCXO Dear time nuts, Background: I have built

Re: [time-nuts] Buffer / distribution amplifier for TCXO

2010-08-04 Thread Henry Hallam
On Wed, Aug 4, 2010 at 1:50 PM, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: The TCXO output waveform is presumably a clipped sinewave as required by the SE4120L? I posted the waveform at http://www.pericynthion.org/stuff/KT3225_500mV_per_div.jpg Does that count as clipped sine? If not,

Re: [time-nuts] Buffer / distribution amplifier for TCXO

2010-08-04 Thread Bruce Griffiths
receiver after attenuating. Bob -- From: Henry Hallam he...@pericynthion.org Sent: Wednesday, August 04, 2010 1:46 PM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] Buffer / distribution amplifier

Re: [time-nuts] Buffer / distribution amplifier for TCXO

2010-08-04 Thread Bruce Griffiths
Henry Hallam wrote: On Wed, Aug 4, 2010 at 1:50 PM, Bruce Griffiths bruce.griffi...@xtra.co.nz wrote: The TCXO output waveform is presumably a clipped sinewave as required by the SE4120L? I posted the waveform at http://www.pericynthion.org/stuff/KT3225_500mV_per_div.jpg Does that

Re: [time-nuts] Buffer / distribution amplifier for TCXO

2010-08-04 Thread Bob Camp
-- From: Henry Hallam he...@pericynthion.org Sent: Wednesday, August 04, 2010 1:46 PM To: Discussion of precise time and frequency measurement time-nuts@febo.com Subject: [time-nuts] Buffer / distribution amplifier for TCXO Dear time nuts, Background: I

Re: [time-nuts] Buffer / distribution amplifier for TCXO

2010-08-04 Thread Bruce Griffiths
measurementtime-nuts@febo.com Subject: [time-nuts] Buffer / distribution amplifier for TCXO Dear time nuts, Background: I have built a GPS receiver based around the SE4120L front end IC [1]. I used a KT3225 TCXO [2] at 16.3676MHz driving the front end through a 10nF series capacitor

Re: [time-nuts] Buffer / distribution amplifier for TCXO

2010-08-04 Thread Bruce Griffiths
Bruce Griffiths wrote: In which case a linear distribution amplifier is probably required. With only a ~3V supply available, options for the distribution amplifier topology are somewhat limited. In principle you could use an emitter follower driving 4 other emitter followers with a resistor

Re: [time-nuts] Buffer / distribution amplifier for TCXO

2010-08-04 Thread Bob Camp
. Bob -- From: Henry Hallamhe...@pericynthion.org Sent: Wednesday, August 04, 2010 1:46 PM To: Discussion of precise time and frequency measurementtime-nuts@febo.com Subject: [time-nuts] Buffer / distribution amplifier for TCXO Dear