1. A high electron mobility resonant body transistor device, comprising:
a substrate;
a first piezoelectric layer disposed onto the surface of the substrate;
a piezoelectric transduction layer disposed onto the surface of the first piezoelectric layer and forming a two dimensional electron gas sheet at the interface between the first piezoelectric layer and the piezoelectric transduction layer, where the first piezoelectric layer and the piezoelectric transduction layer define a resonating membrane;
a source electrode, a top gate electrode, and a drain electrode disposed on the piezoelectric transduction layer and collectively forming a transistor;
a piezoelectric transducer comprised of a back gate electrode and, in response to an applied AC input signal, is configured to induce strain on the resonating membrane to actuate a thickness resonance mode, wherein the back gate electrode is disposed at a location where the induced strain has a maximum value.
2. The resonant body transistor device of claim 1 wherein substrate having a cavity therein and the resonating membrane encloses the cavity.
3. The resonant body transistor device of claim 1 wherein the back gate electrode forms a Schottky contact with the piezoelectric transduction layer and is biased to a depletion region.
4. The resonant body transistor device of claim 1 wherein the drain electrode is disposed at an opposing side of the resonating membrane in relation to the back gate electrode and forms an ohmic contact with the piezoelectric transduction layer.
5. The resonant body transistor device of claim 1 wherein source electrode is disposed between the back gate electrode and the drain electrode on the resonating stack, and forms an ohmic contact with the piezoelectric transduction layer.
6. The resonant body transistor device of claim 1 wherein top gate electrode is disposed between the source electrode and the drain electrode on the resonating membrane and proximate to a second location wherein the induced strain has a maximum value.
7. The resonant body transistor device of claim 1 wherein top gate electrode forms a Schottky contact with the piezoelectric transduction layer.
8. The resonant body transistor device of claim 1 wherein drain-source current is modulated in response to the applied AC input signal, showing resonance peaks at harmonics of the AC input signal frequency.
9. The resonant body transistor device of claim 1 wherein the applied AC input signal overlaps with thickness-mode resonance harmonic frequencies of the resonating membrane.
10. The resonant body transistor device of claim 1 wherein the first piezoelectric layer is comprised of GaN and the piezoelectric transduction layer is comprised of AlGaN.
11. The resonant body transistor device of claim 1 wherein the piezoelectric transducer is implemented by a set of interdigitated transducers disposed on the resonating membrane.
12. The resonant body transistor device of claim 1 wherein the transistor is multi-finger implemented by a number of gate, drain, andor source fingers.
13. A high electron mobility resonant body transistor device, comprising:
a substrate;
a first piezoelectric layer disposed onto the surface of the substrate;
a piezoelectric transduction layer disposed onto the surface of the first piezoelectric layer and forming a two dimensional electron gas sheet at the interface between the first piezoelectric layer and the piezoelectric transduction layer, where the first piezoelectric layer and the piezoelectric transduction layer define a resonating membrane;
a source electrode, a top gate electrode, a drain electrode disposed on the piezoelectric transduction layer, wherein top gate electrode forms a Schottky contact with the piezoelectric transduction layer; and
a piezoelectric transducer comprised of a back gate electrode and, in response to an applied AC input signal, is configured to induce strain on the resonating membrane to actuate a thickness resonance mode, wherein the back gate electrode forms a Schottky contact with the piezoelectric transduction layer and is biased to a depletion region.
14. The resonant body transistor device of claim 13 wherein substrate having a cavity therein and the resonating membrane encloses the cavity.
15. The resonant body transistor device of claim 13 wherein the back gate electrode is disposed proximate to a location where the induced strain has a maximum value
16. The resonant body transistor device of claim 13 wherein the drain and source electrodes form ohmic contacts with the piezoelectric transduction layer.
17. The resonant body transistor device of claim 13 wherein the top gate electrode and the drain electrode are disposed on the resonating membrane such that a second location wherein the induced strain has a maximum value is in between the top gate electrode and the drain electrode.
18. The resonant body transistor device of claim 13 wherein drain-source current is modulated in response to the applied AC input signal, showing resonance peaks at harmonics of the AC input signal frequency.
19. The resonant body transistor device of claim 18 wherein the applied AC input signal overlaps with thickness-mode resonance harmonic frequencies of the resonating membrane.
20. The resonant body transistor device of claim 13 wherein the first piezoelectric layer is comprised of GaN and the piezoelectric transduction layer is comprised of AlGaN.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A battery pack comprising:
a battery module including a projection;
a support which holds the respective projections of a plurality of said battery modules disposed so that the projections are arranged in a straight line; and
a fixing member for fixing the support to the projections.
2. A battery pack according to claim 1, which further comprises a housing which contains the battery modules and a housing fixing member which secures the support to the housing.
3. A battery pack according to claim 1, which further comprises a current lead electrically connected to a cell terminal of the battery module and extending between the projection and the support, and a connecting member which is embedded in that surface of the support which faces the current lead and contacts the current lead, thereby electrically connecting the battery modules to one another.
4. A battery pack according to claim 2, which further comprises an elastic member disposed between the housing and the battery module.
5. A battery pack comprising:
a battery module;
a housing which contains a plurality of said battery modules disposed in a straight line between a first fixing plate extending substantially at right angles from a bottom plate and a tapered second fixing plate extending substantially at right angles from the bottom plate and reduced in thickness with distance from the bottom plate;
a wedge member interposed between the battery module and the second fixing plate of the housing; and
a fixing member for fixing the wedge member to the housing.
6. A battery pack according to claim 5, which further comprises an elastic member disposed between the housing and the battery module.
7. A battery pack comprising:
a battery module;
a fixing plate;
a movable pressure plate opposed to the fixing plate; and
an urging member which urges the pressure plate toward the fixing plate so as to hold the battery modules arranged in a straight line between the fixing plate and the pressure plate, thereby fixing the battery modules.
8. A battery pack comprising:
a battery module provided with a case including an open portion and a cell contained in the case; and
a lid member fitted to the case of each of a plurality of battery modules arranged in a straight line, thereby closing the open portion and fixing the battery modules.
9. A battery pack according to claim 8, which further comprises an elastic member disposed between the lid member and the battery module.
10. A battery pack comprising:
a battery module provided with a cell, which is composed of an electrode group and a non-aqueous electrolyte contained in an armor case and includes a cell terminal electrically connected to the electrode group and protruding outward from the armor case, and a case including a cell containing portion which contains the cell and a terminal hole through which the cell terminal of the cell projects;
a connecting member which is electrically connected to the cell terminal projecting through the terminal hole of the case of each of a plurality of battery modules arranged in a straight line and electrically connects the adjacent battery modules; and
a fixing member for fixing the connecting member to the case of each of the battery modules.