外文翻译---压控高频lc振荡器的设计(编辑修改稿)

外文翻译---压控高频lc振荡器的设计(编辑修改稿)内容摘要：

ccuracy of 177。 , but restricted in the case of low voltage below 3V. Indirect temperature pensation of the digital plus a temperature in the analog pensation circuit voltage conversion circuit analog / digital (A / D) converter, analog convert digital. The Act enables the automatic temperature pensation crystal oscillator frequency stability is very high, but the specific pensation circuit is more plex and higher cost applies only to the precision of base stations and radio stations requirements. development status TCXO by leaps and bounds in the last decade, which in the research and development and production of precision TCXO, Japan39。 s leading and dominant position. Mainstream TCXO devices of ultrasmalby more than 50 times or even 100 times. Beijing ceramics pany in Japan using the reflow soldering method of production of surface mount TCXO thickness from 4mm to 2mm, 压控高频 LC 振荡器的设计 ————————————————————————————— 5 rated 90% of the oscillation amplitude in 4ms after the start of the oscillation can be achieved. Stone (KSS) Group TCXO frequency range of 2 ~ 80MHz stability when the temperature changes from 10 176。 C to 60 176。 C 177。 1ppm or 177。 2ppm。 digital TCXO frequency coverage of ~ 90MHz frequency stability 177。 (30 176。 C ~ +85 176。 C). Japan Donze munication equipment production the type TCO935/937 chip directly Warming TCXO, frequencytemperature characteristics (point frequency ) 177。 1ppm/20 to +70 176。 C 5V 177。 5% supply voltage frequency voltage characteristic 177。 , sine wave output waveform (amplitude 1VPP), current consumption of less than 2mA, weighs just 1g. PiezoTechnology production X3080 type TCXO using surface mount and perforation in two packages, sine wave or logic output can reach 55 176。 C ~ 85 176。 C within 177。 to 177。 1ppm accuracy. The level of domestic products is quite high, such as TCXO, Beijing Ruihua Xin Technology Development Co., Ltd. launched (3240MHz) at room temperature accuracy of better than 177。 1ppm frequency aging rate of 177。 1ppm frequency (mechanical) tuning ≥ 177。 3ppm ≤ 120mw power consumption. High stability TCXO devices, accuracy up to 177。 . Highprecision, low power consumption and miniaturization, TCXO research topics. Facing many difficulties in the miniaturization of the chip type, which has two points: First, miniaturization makes quartz crystal oscillator frequency variable magnitude smaller, temperature pensation is more difficult。 chip package in the reflux welding operations, welding temperature is much higher than the maximum allowable temperature of TCXO, make crystal oscillator frequency change, if adopted to limit local thermal cooling measures, it is difficult to control TCXO frequency variation 177。 10 6 below. However, the the TCXO raise the level of no access to the limit, innovative content and the potential is still large. the application TCXO as a reference oscillator frequency reference for the transmit channel at the same time as the first level of local oscillator receiving channel。 other TCXO as the two local oscillator, the oscillation signal input to the two inverter. The frequency stability of mobile telephone calls for ~ (30 to +75 176。 C), but for cost reasons, usually optional specifications of ~ . The mobile phone 12 ~ 20MHz TCXO representative one of the products is the VCTCXO201C1, using the direct method of pensation, the appearance shown in Figure 2 (b) below, produced by the Japanese stone (KSS). 压控高频 LC 振荡器的设计 ————————————————————————————— 6 Development history Since Edwin Armstrong put forward the heterodyne principle, the oscillator has bee the most basic element. He later found that generate oscillation can be configured through Audion (an early vacuum tube ) .He invented the first electronic oscillator. From nieen tens of Armstrong 39。 s invention to today, The progress of VCO technology through the vacuum tube, transistor oscillator, oscillator module, solution until today based on the RFIC oscillator stages. Vacuum tube oscillator in mercial and military radio receiver has been widely used for many years,For example, AM and FM radio, television ( FM ) as well as military voice munication. However, the invention of semiconductor amplifier device, such as a transist。