发明名称 |
Calculating A Parasitic Capacitance of an Oscillator Circuit |
摘要 |
Described herein are techniques for determining a board parasitic capacitance of a crystal oscillator circuit. A crystal's frequency is measured under load condition off-circuit. After coupling the crystal to the oscillator circuit, external capacitors may be adjusted to produce frequencies approximating the off-circuit measurement with upper and lower margins. Calculation of the load capacitor values at the exact frequency measured off-circuit allows for derivation of the board parasitic capacitance by subtracting the calculated capacitor values from the original total load value used in the off-circuit measurement.
|
申请公布号 |
US2011156725(A1) |
申请公布日期 |
2011.06.30 |
申请号 |
US20090649590 |
申请日期 |
2009.12.30 |
申请人 |
ECHOSTAR TECHNOLOGIES L.L.C. |
发明人 |
CARMICHAEL LESLIE;STEIN MICHELE |
分类号 |
G01R27/26 |
主分类号 |
G01R27/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|