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51.发明申请
公开(公告)号：WO9914854A3
公开(公告)日：1999-06-03
申请号：PCT/IB9801261
申请日：1998-08-17
Applicant: KONINKL PHILIPS ELECTRONICS NV , PHILIPS SVENSKA AB
Inventor： WANG ZHENHUA
Abstract: Known is a two stage high frequency amplifier preceded by a large amplification gain stage providing a fixed swing signal for the two stage amplifier. Particularly in portable devices such as pagers, and mobile or cordless phones, such a receiver structure consumes much power. An amplifier structure is proposed with a cascade of at least four amplifier stages, alternately resistive feedback amplifier stages and non-resistive amplifier stages. Herewith, a dramatic improvement of the gain-bandwidth product is achieved, for the same static power consumption. The amplifier can be used in a PLL of a synthesizer circuit for a pager, cellular or cordless phone, or any other suitable communcation device.
Abstract translation: 已知是两级高频放大器之前的大放大增益级，为两级放大器提供固定的摆幅信号。 特别是在诸如寻呼机，移动或无绳电话的便携式设备中，这种接收机结构消耗大量功率。 提出了具有至少四个放大器级联的交流电阻反馈放大器级和非电阻放大器级的放大器结构。 因此，对于相同的静态功耗，实现了增益带宽乘积的显着改善。 放大器可以用于寻呼机，蜂窝或无绳电话或任何其他合适的通信设备的合成器电路的PLL。
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公开(公告)号：WO9828840A3
公开(公告)日：1998-09-17
申请号：PCT/IB9701538
申请日：1997-12-08
Applicant: PHILIPS ELECTRONICS NV , PHILIPS NORDEN AB
Inventor： ROZA ENGEL
CPC classification number: H03F3/45183 , H03F3/345 , H03F2200/303 , H03F2203/45631 , H03F2203/45654
Abstract: An amplifier comprising an amplifier stage having an input terminal (1) for receiving an input signal; an output terminal (2) for supplying an output signal; an amplifier transistor (4); and a load (5). The load (5) comprises a first (T1) and a second (T2) field effect transistor. The current-voltage characteristic of the load (5) is similar to the diode characteristic of a conventional load formed by means of a diode-connected field effect transistor. The threshold voltage of the load (5) comprising the first (T1) and the second (T2) field effect transistor is much smaller than the threshold voltage of a conventional diode, which results in an improved output voltage swing of the amplifier stage.
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公开(公告)号：WO9522852A3
公开(公告)日：1995-09-21
申请号：PCT/IB9500058
申请日：1995-01-27
Applicant: PHILIPS ELECTRONICS NV , PHILIPS NORDEN AB
Inventor： HUIJSING JOHAN HENDRIK , ESCHAUZIER RUDOLPHE GUSTAVE HU
CPC classification number: H03F1/086
Abstract: A high frequency amplifier arrangement using hybrid nested Miller compensation (HNMC) as a means to frequency compensate amplifiers. The arrangement comprises four amplifier stages, or any other even number higher than four. Each of the four stages can be inverting or balanced pair stages. The Miller compensation is provided by capacitors connected across the output and input of several of the stages, and with a third capacitor connected across the other stages. The HNMC circuit allows the use of lower supply voltages, consumes less supply power, and avoids the need to drive the output transistor with a differential stage. Other variations employ a multipath input stage, and opamps comprising 6 and 8 stages are also described.
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